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Table of Contents

1. 838 relations: Aconcagua, Acrylic fiber, AEC Routemaster, Africa, Agence France-Presse, Airbus A380, Akashi Kaikyo Bridge, Alaska Highway, Albert Einstein, Albumin, Aldebaran, Algol, Alpha Centauri, Alpha helix, Alpha particle, Alps, Amalthea (moon), Amazon River, American Scientist, Amoeba proteus, Andromeda Galaxy, Angel Falls, Angstrom, Antarctica, Antares, Anthrax, Antonov An-124 Ruslan, Antonov An-225 Mriya, Apsis, Aquarius (constellation), Arc de Triomphe, Arcturus, Argentavis, Artificial island, As the crow flies, Association football, Asteroid, Astronomical unit, Astronomy & Astrophysics, Asymptotic giant branch, Atlantic Ocean, Atomic nucleus, Australia, Australian Associated Press, École polytechnique, Bacteria, Bad Astronomy, Ball (association football), Balloon, Barn (unit), ... Expand index (788 more) » « Shrink index

2. Length
3. Lists by length
4. Orders of magnitude

Aconcagua

Aconcagua is a mountain in the Principal Cordillera of the Andes mountain range, in Mendoza Province, Argentina.

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Acrylic fiber

Acrylic fibers are synthetic fibers made from a polymer (polyacrylonitrile) with an average molecular weight of ~100,000, about 1900 monomer units.

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AEC Routemaster

The AEC Routemaster is a front-engined double-decker bus that was designed by London Transport and built by the Associated Equipment Company (AEC) and Park Royal Vehicles.

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Africa

Africa is the world's second-largest and second-most populous continent after Asia.

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Agence France-Presse

Agence France-Presse (AFP) is a French international news agency headquartered in Paris, France.

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Airbus A380

The Airbus A380 is a very large wide-body airliner that was developed and produced by Airbus.

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Akashi Kaikyo Bridge

The is a suspension bridge which links the city of Kobe on the Japanese island of Honshu to on Awaji Island.

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Alaska Highway

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Albert Einstein

Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist who is widely held as one of the most influential scientists. Best known for developing the theory of relativity, Einstein also made important contributions to quantum mechanics. His mass–energy equivalence formula, which arises from relativity theory, has been called "the world's most famous equation".

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Albumin

Albumin is a family of globular proteins, the most common of which are the serum albumins.

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Aldebaran

Aldebaran (lit) is a star located in the zodiac constellation of Taurus.

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Algol

Algol, designated Beta Persei (β Persei, abbreviated Beta Per, β Per), known colloquially as the Demon Star, is a bright multiple star in the constellation of Perseus and one of the first non-nova variable stars to be discovered.

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Alpha Centauri

Alpha Centauri (α Cen, or Alpha Cen) is a triple star system in the southern constellation of Centaurus.

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Alpha helix

An alpha helix (or α-helix) is a sequence of amino acids in a protein that are twisted into a coil (a helix).

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Alpha particle

Alpha particles, also called alpha rays or alpha radiation, consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus.

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Alps

The Alps are one of the highest and most extensive mountain ranges in Europe, stretching approximately across eight Alpine countries (from west to east): Monaco, France, Switzerland, Italy, Liechtenstein, Germany, Austria and Slovenia.

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Amalthea (moon)

Amalthea is a moon of Jupiter.

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Amazon River

The Amazon River (Río Amazonas, Rio Amazonas) in South America is the largest river by discharge volume of water in the world, and the longest or second-longest river system in the world, a title which is disputed with the Nile. The headwaters of the Apurímac River on Nevado Mismi had been considered for nearly a century the Amazon basin's most distant source until a 2014 study found it to be the headwaters of the Mantaro River on the Cordillera Rumi Cruz in Peru.

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American Scientist

American Scientist (informally abbreviated AmSci) is an American bimonthly science and technology magazine published since 1913 by Sigma Xi, The Scientific Research Honor Society.

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Amoeba proteus

Amoeba proteus is a large species of amoeba closely related to another genus of giant amoebae, Chaos.

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Andromeda Galaxy

The Andromeda Galaxy is a barred spiral galaxy and is the nearest major galaxy to the Milky Way.

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Angel Falls

Angel Falls (Salto Ángel; Pemon: Kerepakupai Merú or Parakupá Vená) is a waterfall in Venezuela.

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Angstrom

The angstrom is a unit of length equal to m; that is, one ten-billionth of a metre, a hundred-millionth of a centimetre, 0.1 nanometre, or 100 picometres.

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Antarctica

Antarctica is Earth's southernmost and least-populated continent.

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Antares

Antares is the brightest star in the constellation of Scorpius.

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Anthrax

Anthrax is an infection caused by the bacterium Bacillus anthracis.

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Antonov An-124 Ruslan

The Antonov An-124 Ruslan (Ruslan; NATO reporting name: Condor) is a large, strategic airlift, four-engined aircraft that was designed in the 1980s by the Antonov design bureau in the Ukrainian SSR of the Soviet Union (USSR).

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Antonov An-225 Mriya

The Antonov An-225 Mriya (lit; NATO reporting name: Cossack) was a strategic airlift cargo aircraft designed and produced by the Antonov Design Bureau in the Soviet Union.

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Apsis

An apsis is the farthest or nearest point in the orbit of a planetary body about its primary body.

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Aquarius (constellation)

Aquarius is an equatorial constellation of the zodiac, between Capricornus and Pisces.

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Arc de Triomphe

The Arc de Triomphe de l'Étoile, often called simply the Arc de Triomphe, is one of the most famous monuments in Paris, France, standing at the western end of the Champs-Élysées at the centre of Place Charles de Gaulle, formerly named Place de l'Étoile—the étoile or "star" of the juncture formed by its twelve radiating avenues.

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Arcturus

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Argentavis

Argentavis is an extinct genus of teratornithids known from three sites in the Epecuén and Andalhualá Formations in central and northwestern Argentina dating to the Late Miocene (Huayquerian), where a good sample of fossils have been obtained.

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Artificial island

An artificial island or man-made island is an island that has been constructed by humans rather than formed through natural processes.

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As the crow flies

The expression as the crow flies is an idiom for the most direct path between two points.

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Association football

Association football, more commonly known as football or soccer, is a team sport played between two teams of 11 players each, who primarily use their feet to propel a ball around a rectangular field called a pitch.

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Asteroid

An asteroid is a minor planet—an object that is neither a true planet nor an identified comet— that orbits within the inner Solar System.

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Astronomical unit

The astronomical unit (symbol: au, or AU) is a unit of length defined to be exactly equal to.

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Astronomy & Astrophysics

Astronomy & Astrophysics (A&A) is a monthly peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics.

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Asymptotic giant branch

The asymptotic giant branch (AGB) is a region of the Hertzsprung–Russell diagram populated by evolved cool luminous stars.

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Atlantic Ocean

The Atlantic Ocean is the second-largest of the world's five oceanic divisions, with an area of about.

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Atomic nucleus

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.

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Australia

Australia, officially the Commonwealth of Australia, is a country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands.

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Australian Associated Press

Australian Associated Press (AAP) is an Australian news agency.

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École polytechnique

(also known as Polytechnique or l'X) is a grande école located in Palaiseau, France.

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Bacteria

Bacteria (bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell.

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Bad Astronomy

Bad Astronomy: Misconceptions and Misuses Revealed, from Astrology to the Moon Landing "Hoax" is a non-fiction book by the American astronomer Phil Plait, who is also known as "the Bad Astronomer".

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Ball (association football)

A football is the ball used in the sport of association football.

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Balloon

A balloon is a flexible membrane bag that can be inflated with a gas, such as helium, hydrogen, nitrous oxide, oxygen, or air.

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Barn (unit)

A barn (symbol: b) is a metric unit of area equal to (100 fm2).

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Barnard 68

Barnard 68 is a molecular cloud, dark absorption nebula or Bok globule, towards the southern constellation Ophiuchus and well within the Milky Way galaxy at a distance of about 125 parsecs (407 lightyears).

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Base pair

A base pair (bp) is a fundamental unit of double-stranded nucleic acids consisting of two nucleobases bound to each other by hydrogen bonds.

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Baseball (ball)

A baseball is the ball used in the sport of baseball.

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Bathurst 1000

The Bathurst 1000 (known for sponsorship reasons as the Repco Bathurst 1000) is a touring car race held annually on the Mount Panorama Circuit in Bathurst, New South Wales, Australia.

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Bayeux Tapestry

The Bayeux Tapestry (Tapisserie de Bayeux or La telle du conquest; Tapete Baiocense) is an embroidered cloth nearly long and tall that depicts the events leading up to the Norman Conquest of England in 1066, led by William, Duke of Normandy challenging Harold II, King of England, and culminating in the Battle of Hastings.

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Beach ball

A beach ball is an inflatable ball for beach and water games.

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Beijing

Beijing, previously romanized as Peking, is the capital of China.

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Bellatrix

Bellatrix is the third-brightest star in the constellation of Orion, positioned 5° west of the red supergiant Betelgeuse (Alpha Orionis).

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Bering Strait

The Bering Strait (Beringov proliv) is a strait between the Pacific and Arctic oceans, separating the Chukchi Peninsula of the Russian Far East from the Seward Peninsula of Alaska.

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Berlin

Berlin is the capital and largest city of Germany, both by area and by population.

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Beta Canum Venaticorum

Beta Canum Venaticorum (β Canum Venaticorum, abbreviated Beta CVn, β CVn), also named Chara, is a G-type main-sequence star in the northern constellation of Canes Venatici.

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Betelgeuse

Betelgeuse is a red supergiant star in the constellation of Orion.

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Big Ben

Big Ben is the nickname for the Great Bell of the Great Clock of Westminster, and, by extension, for the clock tower itself, which stands at the north end of the Palace of Westminster in London, England.

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Black hole

A black hole is a region of spacetime where gravity is so strong that nothing, not even light and other electromagnetic waves, is capable of possessing enough energy to escape it.

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Blue

Blue is one of the three primary colours in the RYB colour model (traditional colour theory), as well as in the RGB (additive) colour model.

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Blue whale

The blue whale (Balaenoptera musculus) is a marine mammal and a baleen whale.

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Boötes Void

A map of the Boötes Void The Boötes Void (colloquially referred to as the Great Nothing) is an approximately spherical region of space found in the vicinity of the constellation Boötes, containing only 60 galaxies instead of the 2,000 that should be expected from an area this large, hence its name.

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Boeing 747-400

The Boeing 747-400 is a large, long-range wide-body airliner produced by Boeing Commercial Airplanes, an advanced variant of the initial Boeing 747.

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Boeing 747-8

The Boeing 747-8 is the final series of the large, long-range wide-body airliners in the Boeing 747 family from Boeing Commercial Airplanes.

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Bohr radius

The Bohr radius is a physical constant, approximately equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state.

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Bok globule

In astronomy, Bok globules are isolated and relatively small dark nebulae containing dense cosmic dust and gas from which star formation may take place.

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Bokaro Steel City

Bokaro, officially known as Bokaro Steel City, is a large and planned city in Jharkhand, India.

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Boomerang Nebula

The Boomerang Nebula is a protoplanetary nebula located 1,200 light-years away from Earth in the constellation Centaurus.

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Bordeaux–Paris

The Bordeaux–Paris professional cycle race was one of Europe's classic cycle races, and one of the longest in the professional calendar, covering approximately – more than twice most single-day races.

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Brane

In string theory and related theories (such as supergravity theories), a brane is a physical object that generalizes the notion of a zero-dimensional point particle, a one-dimensional string, or a two-dimensional membrane to higher-dimensional objects.

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Brunei

Brunei, officially Brunei Darussalam, is a country in Southeast Asia, situated on the northern coast of the island of Borneo.

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Buckminsterfullerene

Buckminsterfullerene is a type of fullerene with the formula C60.

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Bureau des Longitudes

The Bureau des Longitudes is a French scientific institution, founded by decree of 25 June 1795 and charged with the improvement of nautical navigation, standardisation of time-keeping, geodesy and astronomical observation.

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Burj Khalifa

The Burj Khalifa (known as the Burj Dubai prior to its inauguration) is a skyscraper in Dubai, United Arab Emirates.

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Caesium

Caesium (IUPAC spelling; cesium in American English) is a chemical element; it has symbol Cs and atomic number 55.

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California

California is a state in the Western United States, lying on the American Pacific Coast.

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Callirrhoe (moon)

Callirrhoe (Greek: Καλλιρρόη), also known as, is one of Jupiter's outer natural satellites.

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Callisto (moon)

Callisto, or Jupiter IV, is the second-largest moon of Jupiter, after Ganymede.

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Canada

Canada is a country in North America.

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Canis Major Overdensity

The Canis Major Overdensity (CMa Overdensity) or Canis Major Dwarf Galaxy (CMa Dwarf) is a disputed dwarf irregular galaxy in the Local Group, located in the same part of the sky as the constellation Canis Major.

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Canopus

Canopus is the brightest star in the southern constellation of Carina and the second-brightest star in the night sky.

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Capella

Capella is the brightest star in the northern constellation of Auriga.

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Car

A car, or an automobile, is a motor vehicle with wheels.

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Carbon

Carbon is a chemical element; it has symbol C and atomic number 6.

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Carbon nanotube

A scanning tunneling microscopy image of a single-walled carbon nanotube Rotating single-walled zigzag carbon nanotube A carbon nanotube (CNT) is a tube made of carbon with a diameter in the nanometre range (nanoscale).

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Carbon-dioxide laser

The carbon-dioxide laser (CO2 laser) was one of the earliest gas lasers to be developed.

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Caribbean Sea

The Caribbean Sea is a sea of the Atlantic Ocean in the tropics of the Western Hemisphere.

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Casablanca

Casablanca (lit) is the largest city in Morocco and the country's economic and business centre.

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Cassette tape

The Compact Cassette, also commonly called a cassette tape, audio cassette, or simply tape or cassette, is an analog magnetic tape recording format for audio recording and playback.

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Cat

The cat (Felis catus), commonly referred to as the domestic cat or house cat, is a small domesticated carnivorous mammal.

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Cat's Eye Nebula

The Cat's Eye Nebula (also known as NGC 6543 and Caldwell 6) is a planetary nebula in the northern constellation of Draco, discovered by William Herschel on February 15, 1786.

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Cayman Trough

The Cayman Trough (also known as the Cayman Trench, Bartlett Deep and Bartlett Trough) is a complex transform fault zone pull-apart basin which contains a small spreading ridge, the Mid-Cayman Rise, on the floor of the western Caribbean Sea between Jamaica and the Cayman Islands.

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Cell (biology)

The cell is the basic structural and functional unit of all forms of life.

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Cell nucleus

The cell nucleus (nuclei) is a membrane-bound organelle found in eukaryotic cells.

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Cell wall

A cell wall is a structural layer that surrounds some cell types, found immediately outside the cell membrane.

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Centaurus A

Centaurus A (also known as NGC 5128 or Caldwell 77) is a galaxy in the constellation of Centaurus.

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Centaurus Cluster

The Centaurus Cluster (A3526) is a cluster of hundreds of galaxies, located approximately 170 million light-years away in the Centaurus constellation.

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Centimetre

Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales. The microwave is in-between 1 meter to 1 millimeter. A centimetre (International spelling) or centimeter (American spelling), with SI symbol cm, is a unit of length in the International System of Units (SI) equal to one hundredth of a metre, centi being the SI prefix for a factor of.

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Central Park

Central Park is an urban park between the Upper West Side and Upper East Side neighborhoods of Manhattan in New York City that was the first landscaped park in the United States.

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Ceres (dwarf planet)

Ceres (minor-planet designation: 1 Ceres) is a dwarf planet in the middle main asteroid belt between the orbits of Mars and Jupiter.

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Cervix

The cervix (cervices) or cervix uteri is a dynamic fibromuscular organ of the female reproductive system that connects the vagina with the uterine cavity.

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CfA2 Great Wall

The Great Wall (also called Coma Wall), sometimes specifically referred to as the CfA2 Great Wall, is an immense galaxy filament.

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Challenger Deep

The Challenger Deep is the deepest known point of the seabed of Earth, located in the western Pacific Ocean at the southern end of the Mariana Trench, in the ocean territory of the Federated States of Micronesia.

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Channel Tunnel

The Channel Tunnel (Tunnel sous la Manche), sometimes referred to informally as the Chunnel, is a undersea railway tunnel, opened in 1994, that connects Folkestone (Kent, England) with Coquelles (Pas-de-Calais, France) beneath the English Channel at the Strait of Dover.

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Charon (moon)

Charon, or (134340) Pluto I, is the largest of the five known natural satellites of the dwarf planet Pluto.

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Chicago

Chicago is the most populous city in the U.S. state of Illinois and in the Midwestern United States.

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Chile

Chile, officially the Republic of Chile, is a country in western South America.

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China

China, officially the People's Republic of China (PRC), is a country in East Asia.

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Chloroplast

A chloroplast is a type of membrane-bound organelle known as a plastid that conducts photosynthesis mostly in plant and algal cells.

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Christ the Redeemer (statue)

Christ the Redeemer (Cristo Redentor, standard) is an Art Deco statue of Jesus Christ in Rio de Janeiro, Brazil, created by French-Polish sculptor Paul Landowski and built by Brazilian engineer Heitor da Silva Costa, in collaboration with French engineer Albert Caquot.

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Chrysler Building

The Chrysler Building is an Art Deco skyscraper on the East Side of Manhattan in New York City, at the intersection of 42nd Street and Lexington Avenue in Midtown Manhattan.

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Circle

A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre.

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Classical electron radius

The classical electron radius is a combination of fundamental physical quantities that define a length scale for problems involving an electron interacting with electromagnetic radiation. Orders of magnitude (length) and classical electron radius are length.

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Cloud

In meteorology, a cloud is an aerosol consisting of a visible mass of miniature liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body or similar space.

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Clyde Cowan

Clyde Lorrain Cowan Jr (December 6, 1919 – May 24, 1974) was an American physicist and the co-discoverer of the neutrino along with Frederick Reines.

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CMB cold spot

The CMB Cold Spot or WMAP Cold Spot is a region of the sky seen in microwaves that has been found to be unusually large and cold relative to the expected properties of the cosmic microwave background radiation (CMBR).

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CN Tower

The CN Tower (Tour CN) is a concrete communications and observation tower in Toronto, Ontario, Canada.

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CNBC

CNBC is an American business news channel owned by NBCUniversal News Group, a unit of Comcast's NBCUniversal.

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Coesite

Coesite is a form (polymorph) of silicon dioxide (SiO2) that is formed when very high pressure (2–3 gigapascals), and moderately high temperature, are applied to quartz.

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Cologne Cathedral

Cologne Cathedral (Kölner Dom,, officially Hohe Domkirche Sankt Petrus, English: Cathedral Church of Saint Peter) is a cathedral in Cologne, North Rhine-Westphalia belonging to the Catholic Church.

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Color

Color (American English) or colour (British and Commonwealth English) is the visual perception based on the electromagnetic spectrum.

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Colossal squid

The colossal squid (Mesonychoteuthis hamiltoni) is the largest member of its family Cranchiidae, the cockatoo or glass squids, with its second largest member being Megalocranchia fisheri.

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Coma Cluster

The Coma Cluster (Abell 1656) is a large cluster of galaxies that contains over 1,000 identified galaxies.

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Comet

A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing.

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Comet Hale–Bopp

Comet Hale–Bopp (formally designated C/1995 O1) is a comet that was one of the most widely observed of the 20th century and one of the brightest seen for many decades.

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Comet Hyakutake

Comet Hyakutake (formally designated C/1996 B2 (Hyakutake)) is a comet discovered on 31 January 1996.

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Common sunflower

The common sunflower (Helianthus annuus) is a species of large annual forb of the daisy family Asteraceae.

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Comoving and proper distances

In standard cosmology, comoving distance and proper distance (or physical distance) are two closely related distance measures used by cosmologists to define distances between objects.

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Compact disc

The compact disc (CD) is a digital optical disc data storage format that was codeveloped by Philips and Sony to store and play digital audio recordings.

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Compton wavelength

The Compton wavelength is a quantum mechanical property of a particle, defined as the wavelength of a photon whose energy is the same as the rest energy of that particle (see mass–energy equivalence).

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Concorde

Concorde is a retired Anglo-French supersonic airliner jointly developed and manufactured by Sud Aviation (later Aérospatiale) and the British Aircraft Corporation (BAC).

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Cook Strait

Cook Strait (Te Moana-o-Raukawa) is a strait that separates the North and South Islands of New Zealand.

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Cornea

The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.

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Cosmic inflation

In physical cosmology, cosmic inflation, cosmological inflation, or just inflation, is a theory of exponential expansion of space in the early universe.

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Cosmic microwave background

The cosmic microwave background (CMB or CMBR) is microwave radiation that fills all space in the observable universe.

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Cosmic string

Cosmic strings are hypothetical 1-dimensional topological defects which may have formed during a symmetry-breaking phase transition in the early universe when the topology of the vacuum manifold associated to this symmetry breaking was not simply connected.

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Cotton

Cotton is a soft, fluffy staple fiber that grows in a boll, or protective case, around the seeds of the cotton plants of the genus Gossypium in the mallow family Malvaceae.

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Covalent bond

A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.

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Covalent radius

The covalent radius, rcov, is a measure of the size of an atom that forms part of one covalent bond.

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Credit card

A credit card is a payment card, usually issued by a bank, allowing its users to purchase goods or services or withdraw cash on credit.

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Cross section (physics)

In physics, the cross section is a measure of the probability that a specific process will take place in a collision of two particles.

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CT Chamaeleontis

CT Chamaeleontis (CT Cha) is a T Tauri star - a primary of the star system in the constellation of Chamaeleon.

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Cube

In geometry, a cube is a three-dimensional solid object bounded by six square faces.

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Cubic metre

The cubic metre (in Commonwealth English and international spelling as used by the International Bureau of Weights and Measures) or cubic meter (in American English) is the unit of volume in the International System of Units (SI).

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Cyan

Cyan is the color between blue and green on the visible spectrum of light.

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Cygnus (constellation)

Cygnus is a northern constellation on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan.

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Dam

A dam is a barrier that stops or restricts the flow of surface water or underground streams.

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Danube

The Danube (see also other names) is the second-longest river in Europe, after the Volga in Russia.

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Debris disk

A debris disk (American English), or debris disc (Commonwealth English), is a circumstellar disk of dust and debris in orbit around a star.

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Decametre

A decametre (International spelling as used by the International Bureau of Weights and Measures and by most English speaking countries, United States spelling dekameter or decameter), symbol dam ("da" for the SI prefix deca-, "m" for the SI unit metre), is a unit of length in the International System of Units (SI) equal to ten metres.

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Decimetre

The decimetre (or decimeter in American English; symbol: dm), is a unit of length in the International System of Units, equal to one tenth of a metre, ten centimetres, one hundred millimetres, and 3.937 inches.

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Deimos (moon)

Deimos (systematic designation: Mars II) is the smaller and outer of the two natural satellites of Mars, the other being Phobos.

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Demodex

Demodex is a genus of tiny mites that live in or near hair follicles of mammals.

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Denali

Denali (also known as Mount McKinley, its former official name) is the highest mountain peak in North America, with a summit elevation of above sea level.

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Deneb

Deneb is a first-magnitude blue supergiant star in the constellation of Cygnus.

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Diameter

In geometry, a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle. Orders of magnitude (length) and diameter are length.

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Diamond

Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic.

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Diatomic carbon

Diatomic carbon (systematically named dicarbon and 1λ2,2λ2-ethene), is a green, gaseous inorganic chemical with the chemical formula C.

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Dingo Fence

The Dingo Fence or Dog Fence is a pest-exclusion fence in Australia to keep dingoes out of the relatively fertile south-east part of the continent (where they have largely been exterminated) and protect the sheep flocks of southern Queensland.

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Disk read-and-write head

A disk read-and-write head is the small part of a disk drive which moves above the disk platter and transforms the platter's magnetic field into electric current (reads the disk) or, vice versa, transforms electric current into magnetic field (writes the disk).

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Distance

Distance is a numerical or occasionally qualitative measurement of how far apart objects, points, people, or ideas are.

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Distance measure

Distance measures are used in physical cosmology to give a natural notion of the distance between two objects or events in the universe.

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DNA

Deoxyribonucleic acid (DNA) is a polymer composed of two polynucleotide chains that coil around each other to form a double helix.

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Dogger Bank

Dogger Bank (Dutch: Doggersbank, German: Doggerbank, Danish: Doggerbanke) is a large sandbank in a shallow area of the North Sea about off the east coast of England.

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Douro

The Douro (Duero; Mirandese: Douro ˈdowɾʊ; Durius) is the largest river of the Iberian Peninsula by discharge.

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Drosophila bifurca

Drosophila bifurca is a species of fruit fly.

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Dual in-line package

In microelectronics, a dual in-line package (DIP or DIL) is an electronic component package with a rectangular housing and two parallel rows of electrical connecting pins.

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Dubai

Dubai (translit) is the most populous city in the United Arab Emirates (UAE) and the capital of the Emirate of Dubai, the most populated of the country's seven emirates.

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Dublin

Dublin is the capital of the Republic of Ireland and also the largest city by size on the island of Ireland.

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Dust

Dust is made of fine particles of solid matter.

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Dwarf galaxy

A dwarf galaxy is a small galaxy composed of about 1000 up to several billion stars, as compared to the Milky Way's 200–400 billion stars.

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Dwarf planet

A dwarf planet is a small planetary-mass object that is in direct orbit around the Sun, massive enough to be gravitationally rounded, but insufficient to achieve orbital dominance like the eight classical planets of the Solar System.

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Earth

Earth is the third planet from the Sun and the only astronomical object known to harbor life.

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Earth radius

Earth radius (denoted as R🜨 or RE) is the distance from the center of Earth to a point on or near its surface.

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Earth's orbit

Earth orbits the Sun at an average distance of 149.60 million km (8.317 light minutes, 92.96 million mi) in a counterclockwise direction as viewed from above the Northern Hemisphere.

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Egg cell

The egg cell or ovum (ova) is the female reproductive cell, or gamete, in most anisogamous organisms (organisms that reproduce sexually with a larger, female gamete and a smaller, male one).

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Eiffel Tower

The Eiffel Tower (Tour Eiffel) is a wrought-iron lattice tower on the Champ de Mars in Paris, France.

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El Paso, Texas

El Paso is a city in and the county seat of El Paso County, Texas, United States.

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Electron

The electron (or in nuclear reactions) is a subatomic particle with a negative one elementary electric charge.

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Electron microscope

An electron microscope is a microscope that uses a beam of electrons as a source of illumination.

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Electronvolt

In physics, an electronvolt (symbol eV), also written electron-volt and electron volt, is the measure of an amount of kinetic energy gained by a single electron accelerating through an electric potential difference of one volt in vacuum.

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Elephant

Elephants are the largest living land animals.

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Ellipsoid

An ellipsoid is a surface that can be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation.

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Elliptical galaxy

An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image.

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Empire State Building

The Empire State Building is a 102-story Art Deco skyscraper in the Midtown South neighborhood of Manhattan in New York City.

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Engineering tolerance

Engineering tolerance is the permissible limit or limits of variation in.

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English Channel

The English Channel, also known as the Channel, is an arm of the Atlantic Ocean that separates Southern England from northern France.

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Epsilon Pegasi

Epsilon Pegasi (Latinised from ε Pegasi, abbreviated Epsilon Peg, ε Peg), formally named Enif, is the brightest star in the northern constellation of Pegasus.

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Equator

The equator is a circle of latitude that divides a spheroid, such as Earth, into the Northern and Southern hemispheres.

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Equatorial bulge

An equatorial bulge is a difference between the equatorial and polar diameters of a planet, due to the centrifugal force exerted by the rotation about the body's axis.

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Eridanus Cluster

The Eridanus Cluster is a galaxy cluster roughly from Earth, containing about 73 main galaxies and about 200 total galaxies.

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Eris (dwarf planet)

Eris (minor-planet designation: 136199 Eris) is the most massive and second-largest known dwarf planet in the Solar System.

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Escherichia coli

Escherichia coliWells, J. C. (2000) Longman Pronunciation Dictionary.

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Eta and eta prime mesons

The eta and eta prime meson are isosinglet mesons made of a mixture of up, down and strange quarks and their antiquarks.

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Eta Carinae

Eta Carinae (η Carinae, abbreviated to η Car), formerly known as Eta Argus, is a stellar system containing at least two stars with a combined luminosity greater than five million times that of the Sun, located around distant in the constellation Carina.

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Euglena gracilis

Euglena gracilis is a freshwater species of single-celled alga in the genus Euglena.

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Europa (moon)

Europa, or Jupiter II, is the smallest of the four Galilean moons orbiting Jupiter, and the sixth-closest to the planet of all the 95 known moons of Jupiter.

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Europe

Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere.

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Event horizon

In astrophysics, an event horizon is a boundary beyond which events cannot affect an observer.

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Everything2

Everything2 (styled Everything2 or E2 for short) is a collaborative online community consisting of a database of interlinked user-submitted written material.

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Exoplanet

An exoplanet or extrasolar planet is a planet outside the Solar System.

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Exosphere

The exosphere (ἔξω éxō "outside, external, beyond", σφαῖρα sphaĩra "sphere") is a thin, atmosphere-like volume surrounding a planet or natural satellite where molecules are gravitationally bound to that body, but where the density is so low that the molecules are essentially collision-less.

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Extreme ultraviolet lithography

Extreme ultraviolet lithography (EUVL, also known simply as EUV) is a new technology used in the semiconductor industry for manufacturing integrated circuits (ICs).

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Fédération Aéronautique Internationale

The (FAI; World Air Sports Federation) is the world governing body for air sports, and also stewards definitions regarding human spaceflight.

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Femtometre

The femtometre (American spelling femtometer), symbol fm, (derived from the Danish and Norwegian word femten 'fifteen', lit) is a unit of length in the International System of Units (SI) equal to 10−15 metres, which means a quadrillionth of one metre.

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Fencing

Fencing is a combat sport that features sword fighting.

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Fermi problem

In physics or engineering education, a Fermi problem (or Fermi quiz, Fermi question, Fermi estimate), also known as a order-of-magnitude problem (or order-of-magnitude estimate, order estimation), is an estimation problem designed to teach dimensional analysis or approximation of extreme scientific calculations.

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Finger

A finger is a prominent digit on the forelimbs of most tetrapod vertebrate animals, especially those with prehensile extremities (i.e. hands) such as humans and other primates.

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Fjord

In physical geography, a fjord or fiord is a long, narrow sea inlet with steep sides or cliffs, created by a glacier.

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Flagellum

A flagellum (flagella) (Latin for 'whip' or 'scourge') is a hairlike appendage that protrudes from certain plant and animal sperm cells, from fungal spores (zoospores), and from a wide range of microorganisms to provide motility.

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Flea

Flea, the common name for the order Siphonaptera, includes 2,500 species of small flightless insects that live as external parasites of mammals and birds.

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Flying height

The flying height or floating height or head gap is the distance between the disk read/write head on a hard disk drive and the platter.

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Fog

Fog is a visible aerosol consisting of tiny water droplets or ice crystals suspended in the air at or near the Earth's surface.

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Foot (unit)

The foot (standard symbol: ft) is a unit of length in the British imperial and United States customary systems of measurement.

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Football pitch

A football pitch (also known as a soccer field in the United States) is the playing surface for the game of association football.

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Fornax Cluster

The Fornax Cluster is a cluster of galaxies lying at a distance of 19 megaparsecs (62 million light-years).

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Fort Kent, Maine

Fort Kent (French: Fort-Kent) is a town in Aroostook County, Maine, United States, situated at the confluence of the Fish River and the Saint John River, on the border with New Brunswick, Canada.

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France

France, officially the French Republic, is a country located primarily in Western Europe.

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Frederick Reines

Frederick Reines (March 16, 1918 – August 26, 1998) was an American physicist.

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Galactic plane

The galactic plane is the plane on which the majority of a disk-shaped galaxy's mass lies.

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Galactic year

The galactic year, also known as a cosmic year, is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy.

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Galaxy

A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity.

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Galaxy cluster

A galaxy cluster, or a cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity, with typical masses ranging from 1014 to 1015 solar masses.

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Galaxy filament

In cosmology, galaxy filaments are the largest known structures in the universe, consisting of walls of galactic superclusters.

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Galilean moons

The Galilean moons, or Galilean satellites, are the four largest moons of Jupiter: Io, Europa, Ganymede, and Callisto.

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Gamma ray

A gamma ray, also known as gamma radiation (symbol), is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei.

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Gamma-ray burst

In gamma-ray astronomy, gamma-ray bursts (GRBs) are immensely energetic explosions that have been observed in distant galaxies, being the brightest and most extreme explosive events in the entire universe, as NASA describes the bursts as the "most powerful class of explosions in the universe".

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Ganymede (moon)

Ganymede, or Jupiter III, is the largest and most massive natural satellite of Jupiter and in the Solar System.

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Gateway Arch

The Gateway Arch is a monument in St. Louis, Missouri, United States.

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Geography of Australia

The geography of Australia encompasses a wide variety of biogeographic regions being the world's smallest continent, while comprising the territory of the sixth-largest country in the world.

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Geography of Finland

The geography of Finland is characterized by its northern position, its ubiquitous landscapes of intermingled boreal forests and lakes, and its low population density.

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Geography of Norway

Norway is a country located in Northern Europe in the northern and western parts of the Scandinavian Peninsula.

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Geography of Sweden

Sweden is a country in Northern Europe on the Scandinavian Peninsula.

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Geometric mean

In mathematics, the geometric mean is a mean or average which indicates a central tendency of a finite set of real numbers by using the product of their values (as opposed to the arithmetic mean which uses their sum).

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Geostationary orbit

A geostationary orbit, also referred to as a geosynchronous equatorial orbitGeostationary orbit and Geosynchronous (equatorial) orbit are used somewhat interchangeably in sources.

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Germany

Germany, officially the Federal Republic of Germany (FRG), is a country in Central Europe.

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Giant Gippsland earthworm

The giant Gippsland earthworm (Megascolides australis), is one of Australia's 1,000 native earthworm species.

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Giant squid

The giant squid (Architeuthis dux) is a species of deep-ocean dwelling squid in the family Architeuthidae.

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Giraffe

The giraffe is a large African hoofed mammal belonging to the genus Giraffa.

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Giridih

Giridih is headquarters of the Giridih district of Jharkhand state, India.

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Gliese 581d

Gliese 581d (often shortened to Gl 581d or GJ 581d) is a doubtful, and frequently disputed, exoplanet candidate orbiting within the Gliese 581 system, approximately 20.4 light-years away in the Libra constellation.

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Globular cluster

A globular cluster is a spheroidal conglomeration of stars that is bound together by gravity, with a higher concentration of stars towards its center.

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Glucose

Glucose is a sugar with the molecular formula.

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Gluon

A gluon is a type of massless elementary particle that mediates the strong interaction between quarks, acting as the exchange particle for the interaction.

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Gobi Desert

The Gobi Desert (Говь) is a large, cold desert and grassland region in northern China and southern Mongolia and is the sixth largest desert in the world.

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Golden Gate Bridge

The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the strait connecting San Francisco Bay and the Pacific Ocean.

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Golf ball

A golf ball is a ball designed to be used in golf.

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Goliath birdeater

The Goliath birdeater (Theraphosa blondi) belongs to the tarantula family Theraphosidae.

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Goliath frog

The goliath frog (Conraua goliath), otherwise known commonly as the giant slippery frog and the goliath bullfrog, is a species of frog in the family Conrauidae.

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Googol

A googol is the large number 10100 or ten to the power of one hundred.

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Googolplex

A googolplex is the large number 10, or equivalently, 10 or.

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GQ Lupi b

GQ Lupi b, or GQ Lupi B, is a possible extrasolar planet, brown dwarf or sub-brown dwarf orbiting the star GQ Lupi.

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Gram stain

Gram stain (Gram staining or Gram's method), is a method of staining used to classify bacterial species into two large groups: gram-positive bacteria and gram-negative bacteria.

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Gram-positive bacteria

In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall.

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Grand Canyon

The Grand Canyon is a steep-sided canyon carved by the Colorado River in Arizona, United States.

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Grand Union Canal

The Grand Union Canal in England is part of the British canal system.

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Graphene

Graphene is an allotrope of carbon consisting of a single layer of atoms arranged in a honeycomb nanostructure.

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Gravitational field

In physics, a gravitational field or gravitational acceleration field is a vector field used to explain the influences that a body extends into the space around itself.

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Gravitational singularity

A gravitational singularity, spacetime singularity or simply singularity is a condition in which gravity is predicted to be so intense that spacetime itself would break down catastrophically.

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Gravitational wave

Gravitational waves are waves of the intensity of gravity that are generated by the accelerated masses of binary stars and other motions of gravitating masses, and propagate as waves outward from their source at the speed of light.

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GRB 980425

GRB 980425 was a gamma-ray burst (GRB) that was detected on 25 April 1998 at 21:49 UTC.

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GRB 990123

GRB 990123 is a gamma-ray burst which was detected on January 23, 1999.

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Great Barrier Reef

The Great Barrier Reef is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching for over over an area of approximately.

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Great Pyramid of Giza

The Great Pyramid of Giza is the largest Egyptian pyramid.

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Great Red Spot

The Great Red Spot is a persistent high-pressure region in the atmosphere of Jupiter, producing an anticyclonic storm that is the largest in the Solar System.

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Great Wall of China

The Great Wall of China (literally "ten thousand ''li'' long wall") is a series of fortifications that were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic groups from the Eurasian Steppe.

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Green

Green is the color between cyan and yellow on the visible spectrum.

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Guinness World Records

Guinness World Records, known from its inception in 1955 until 1999 as The Guinness Book of Records and in previous United States editions as The Guinness Book of World Records, is a British reference book published annually, listing world records both of human achievements and the extremes of the natural world.

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Hair

Hair is a protein filament that grows from follicles found in the dermis.

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Hair follicle

The hair follicle is an organ found in mammalian skin.

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Halley's Comet

Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing every 72–80 years.

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Hand (unit)

The hand is a non-SI unit of measurement of length standardized to.

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Hard disk drive

A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magnetic material.

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Hartle–Hawking state

The Hartle–Hawking state, also known as the no-boundary wave function is a proposal in theoretical physics concerning the state of the universe prior to the Planck epoch.

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Haumea

Haumea (minor-planet designation: 136108 Haumea) is a dwarf planet located beyond Neptune's orbit.

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Hawaii

Hawaii (Hawaii) is an island state of the United States, in the Pacific Ocean about southwest of the U.S. mainland.

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HD 100546

HD 100546, also known as KR Muscae, is a pre-main sequence star of spectral type B8 to A0 located from Earth in the southern constellation of Musca.

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HD 149026 b

HD 149026 b, formally named Smertrios, is an extrasolar planet and hot Jupiter approximately 250 light-years from the Sun in the constellation of Hercules.

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Hectare

The hectare (SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), that is, 10,000 square meters (10,000 m2), and is primarily used in the measurement of land.

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Hectometre

The hectometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: hm) or hectometer (American spelling) is a unit of length in the International System of Units (SI), equal to one hundred metres and to one tenth of a kilometre.

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Heliosphere

The heliosphere is the magnetosphere, astrosphere, and outermost atmospheric layer of the Sun.

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Helium

Helium (from lit) is a chemical element; it has symbol He and atomic number 2.

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Helix

A helix is a shape like a cylindrical coil spring or the thread of a machine screw.

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Helix Nebula

The Helix Nebula (also known as NGC 7293 or Caldwell 63) is a planetary nebula (PN) located in the constellation Aquarius.

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Hemoglobin

Hemoglobin (haemoglobin, Hb or Hgb) is a protein containing iron that facilitates the transport of oxygen in red blood cells.

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HEPA

HEPA (high-efficiency particulate air) filter, also known as high-efficiency particulate absorbing filter and high-efficiency particulate arrestance filter, is an efficiency standard of air filters.

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Hertz

The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second.

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High Force

High Force is a waterfall on the River Tees, near Middleton-in-Teesdale, Teesdale, England.

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High Speed 1

High Speed 1 (HS1), legally the Channel Tunnel Rail Link (CTRL), is a high-speed railway linking London with the Channel Tunnel.

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High-resolution transmission electron microscopy

High-resolution transmission electron microscopy is an imaging mode of specialized transmission electron microscopes that allows for direct imaging of the atomic structure of samples.

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Hill sphere

The Hill sphere is a common model for the calculation of a gravitational sphere of influence.

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HIP 56948

HIP 56948 (also known as HD 101364) is a solar twin star of type G5V.

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Hipparcos

Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.

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HIV

The human immunodeficiency viruses (HIV) are two species of Lentivirus (a subgroup of retrovirus) that infect humans.

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HIV/AIDS

The human immunodeficiency virus (HIV) is a retrovirus that attacks the immune system.

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Homo floresiensis

Homo floresiensis also known as "Flores Man") is an extinct species of small archaic human that inhabited the island of Flores, Indonesia, until the arrival of modern humans about 50,000 years ago.

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Hong Kong

Hong Kong is a special administrative region of the People's Republic of China.

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Horologium-Reticulum Supercluster

The Horologium-Reticulum Supercluster, is a massive supercluster spanning around 550 million light-years.

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Houlton, Maine

Houlton is a town in and the county seat of Aroostook County, Maine, United States, on the Canada–United States border.

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House dust mite

House dust mites (HDM, or simply dust mites) are various species of acariform mites belonging to the family Pyroglyphidae that are found in association with dust in dwellings.

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Hubble Deep Field

The Hubble Deep Field (HDF) is an image of a small region in the constellation Ursa Major, constructed from a series of observations by the Hubble Space Telescope.

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Hubble Space Telescope

The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.

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Human

Humans (Homo sapiens, meaning "thinking man") or modern humans are the most common and widespread species of primate, and the last surviving species of the genus Homo.

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Hume Highway

Hume Highway, inclusive of the sections now known as Hume Freeway and Hume Motorway, is one of Australia's major inter-city national highways, running for between Melbourne in the southwest and Sydney in the northeast.

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Hydrogen

Hydrogen is a chemical element; it has symbol H and atomic number 1.

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Hydrogen atom

A hydrogen atom is an atom of the chemical element hydrogen.

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Hydrogen line

The hydrogen line, 21 centimeter line, or H I line is a spectral line that is created by a change in the energy state of solitary, electrically neutral hydrogen atoms.

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Hyperfine structure

In atomic physics, hyperfine structure is defined by small shifts in otherwise degenerate electronic energy levels and the resulting splittings in those electronic energy levels of atoms, molecules, and ions, due to electromagnetic multipole interaction between the nucleus and electron clouds.

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Hypergiant

A hypergiant (luminosity class 0 or Ia+) is a very rare type of star that has an extremely high luminosity, mass, size and mass loss because of its extreme stellar winds.

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Hyperion (tree)

Hyperion is a coast redwood (Sequoia sempervirens) in California that is the world's tallest known living tree, measuring 115.92 m (380.3 ft).

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HyperPhysics

HyperPhysics is an educational website about physics topics.

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Iapetus (moon)

Iapetus is the outermost of Saturn's large moons.

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IC 10

IC 10 is an irregular galaxy in the constellation Cassiopeia.

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IC 1101

IC 1101 is a class S0 supergiant (cD) lenticular galaxy at the center of the Abell 2029 galaxy cluster.

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IC 342/Maffei Group

The IC 342/Maffei Group (also known as the IC 342 Group or the Maffei 1 Group) corresponds to one or two galaxy groups close to the Local Group.

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Ice

Ice is water that is frozen into a solid state, typically forming at or below temperatures of 0 °C, 32 °F, or 273.15 K. It occurs naturally on Earth, on other planets, in Oort cloud objects, and as interstellar ice.

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Inch

The inch (symbol: in or pprime) is a unit of length in the British Imperial and the United States customary systems of measurement.

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India

India, officially the Republic of India (ISO), is a country in South Asia.

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Indianapolis 500

The Indianapolis 500, formally known as the Indianapolis 500-Mile Race, and commonly shortened to Indy 500, is an annual automobile race held at the Indianapolis Motor Speedway in Speedway, Indiana, United States, an enclave suburb of Indianapolis.

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Indigo

Indigo is a term used for a number of hues in the region of blue.

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Infrared

Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves.

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Intel 4004

The Intel 4004 is a 4-bit central processing unit (CPU) released by Intel Corporation in 1971.

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International Astronomical Union

The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international non-governmental organization (INGO) with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach, education, and development through global cooperation.

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International Space Station

The International Space Station (ISS) is a large space station assembled and maintained in low Earth orbit by a collaboration of five space agencies and their contractors: NASA (United States), Roscosmos (Russia), ESA (Europe), JAXA (Japan), and CSA (Canada).

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International System of Units

The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement.

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Interstate 90

Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at.

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Interstate 95

Interstate 95 (I-95) is the main north–south Interstate Highway on the East Coast of the United States, running from U.S. Route 1 (US 1) in Miami, Florida, north to the Houlton–Woodstock Border Crossing between Maine and the Canadian province of New Brunswick.

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Io (moon)

Io, or Jupiter I, is the innermost and second-smallest of the four Galilean moons of the planet Jupiter.

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Iran

Iran, officially the Islamic Republic of Iran (IRI), also known as Persia, is a country in West Asia. It borders Turkey to the northwest and Iraq to the west, Azerbaijan, Armenia, the Caspian Sea, and Turkmenistan to the north, Afghanistan to the east, Pakistan to the southeast, the Gulf of Oman and the Persian Gulf to the south.

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ISM radio band

The ISM radio bands are portions of the radio spectrum reserved internationally for industrial, scientific, and medical (ISM) purposes, excluding applications in telecommunications.

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ISO/IEC 7810

ISO/IEC 7810 Identification cards — Physical characteristics is an international standard that defines the physical characteristics for identification cards.

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Italy

Italy, officially the Italian Republic, is a country in Southern and Western Europe.

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James Webb Space Telescope

The James Webb Space Telescope (JWST) is a space telescope designed to conduct infrared astronomy.

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Japan

Japan is an island country in East Asia, located in the Pacific Ocean off the northeast coast of the Asian mainland.

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Japanese spider crab

The Japanese spider crab (Macrocheira kaempferi) is a species of marine crab and is the biggest one that lives in the waters around Japan.

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Jules Verne

Jules Gabriel Verne (Longman Pronunciation Dictionary.; 8 February 1828 – 24 March 1905) was a French novelist, poet, and playwright.

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Jupiter

Jupiter is the fifth planet from the Sun and the largest in the Solar System.

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K2

K2, at above sea level, is the second-highest mountain on Earth, after Mount Everest at.

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Kalahari Desert

The Kalahari Desert is a large semi-arid sandy savanna in Southern Africa extending for, covering much of Botswana, as well as parts of Namibia and South Africa.

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Kansas State University

Kansas State University (KSU, Kansas State, or K-State) is a public land-grant research university with its main campus in Manhattan, Kansas.

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Kármán line

The Kármán line (or von Kármán line) is a conventional definition of the edge of space.

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Key West

Key West is an island in the Straits of Florida, within the U.S. state of Florida.

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Kilometre

The kilometre (SI symbol: km; or), spelt kilometer in American English and Philippine English, is a unit of length in the International System of Units (SI), equal to one thousand metres (kilo- being the SI prefix for). It is the preferred measurement unit to express distances between geographical places on land in most of the world; notable exceptions are the United States and the United Kingdom where the statute mile is used.

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Kingda Ka

Kingda Ka is a hydraulically-launched steel roller coaster located at Six Flags Great Adventure in Jackson, New Jersey, United States.

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Kuiper belt

The Kuiper belt is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune at 30 astronomical units (AU) to approximately 50 AU from the Sun.

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KVLY-TV mast

The KVLY-TV mast (formerly the KTHI-TV mast) is a television-transmitting mast in Blanchard, North Dakota.

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Kyiv

Kyiv (also Kiev) is the capital and most populous city of Ukraine.

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Lake

A lake is an often naturally occurring, relatively large and fixed body of water on or near the Earth's surface.

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Lake Baikal

Lake Baikal (Ozero Baykal; Baigal dalai) is a large rift lake in Russia.

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Lake Geneva

Lake Geneva (Léman, lac Léman, rarely lac de Genève; Lago Lemano; Genfersee; Lai da Genevra) is a deep lake on the north side of the Alps, shared between Switzerland and France.

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Lake Pontchartrain Causeway

The Lake Pontchartrain Causeway (Chaussée du lac Pontchartrain), also known simply as The Causeway, is a fixed link composed of two parallel bridges crossing Lake Pontchartrain in southeastern Louisiana, United States.

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Land's End to John o' Groats

Land's End to John o' Groats is the traversal of the length of the island of Great Britain between two extremities, in the southwest and northeast.

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Langley Research Center

The Langley Research Center (LaRC or NASA Langley), located in Hampton, Virginia near the Chesapeake Bay front of Langley Air Force Base, is the oldest of NASA's field centers.

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Large Hadron Collider

The Large Hadron Collider (LHC) is the world's largest and highest-energy particle collider.

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Large Magellanic Cloud

The Large Magellanic Cloud (LMC) is a dwarf galaxy and satellite galaxy of the Milky Way.

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Laser Interferometer Space Antenna

The Laser Interferometer Space Antenna (LISA) is a planned space probe to detect and accurately measure gravitational waves—tiny ripples in the fabric of spacetime—from astronomical sources.

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Latitude

In geography, latitude is a coordinate that specifies the north–south position of a point on the surface of the Earth or another celestial body.

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League (unit)

A league is a unit of length.

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Leaning Tower of Pisa

The Leaning Tower of Pisa (torre pendente di Pisa), or simply the Tower of Pisa (torre di Pisa), is the campanile, or freestanding bell tower, of Pisa Cathedral.

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Leatherback sea turtle

The leatherback sea turtle (Dermochelys coriacea), sometimes called the lute turtle, leathery turtle or simply the luth, is the largest of all living turtles and the heaviest non-crocodilian reptile, reaching lengths of up to and weights of.

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Leda (moon)

Leda, also known as, is a prograde irregular satellite of Jupiter.

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Leedsichthys

Leedsichthys is an extinct genus of pachycormid fish that lived in the oceans of the Middle to Late Jurassic.

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Lego

Lego (stylised as LEGO) is a line of plastic construction toys manufactured by the Lego Group, a privately held company based in Billund, Denmark.

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Length

Length is a measure of distance.

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Leo I (dwarf galaxy)

Leo I is a dwarf spheroidal galaxy in the constellation Leo.

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Lexell's Comet

D/1770 L1, popularly known as Lexell's Comet after its orbit computer Anders Johan Lexell, was a comet discovered by astronomer Charles Messier in June 1770.

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Li (unit)

Li (lǐ, or 市里, shìlǐ), also known as the Chinese mile, is a traditional Chinese unit of distance.

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Light

Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye.

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Light-second

The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics.

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Light-year

A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km (Scientific notation: 9.4607304725808 × 1012 km), which is approximately 5.88 trillion mi.

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LIGO

The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a large-scale physics experiment and observatory designed to detect cosmic gravitational waves and to develop gravitational-wave observations as an astronomical tool.

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Lineus longissimus

The bootlace worm (Lineus longissimus) is a species of ribbon worm and one of the longest known animals, with specimens up to long being reported.

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Lion's mane jellyfish

The lion's mane jellyfish (Cyanea capillata), also known as the giant jellyfish, arctic red jellyfish, or the hair jelly, is one of the largest known species of jellyfish.

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List of humorous units of measurement

Many people have made use of, or invented, units of measurement intended primarily for their humor value.

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List of largest stars

Below are lists of the largest stars currently known, ordered by radius and separated into categories by galaxy.

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List of longest runways

; Notes. Orders of magnitude (length) and List of longest runways are lists by length.

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List of the most distant astronomical objects

This article documents the most distant astronomical objects discovered and verified so far, and the time periods in which they were so classified.

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Lithium fluoride

Lithium fluoride is an inorganic compound with the chemical formula LiF.

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Litre

The litre (British English spelling) or liter (American English spelling) (SI symbols L and l, other symbol used: ℓ) is a metric unit of volume. It is equal to 1 cubic decimetre (dm3), 1000 cubic centimetres (cm3) or 0.001 cubic metres (m3). A cubic decimetre (or litre) occupies a volume of (see figure) and is thus equal to one-thousandth of a cubic metre.

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Liver

The liver is a major metabolic organ exclusively found in vertebrate animals, which performs many essential biological functions such as detoxification of the organism, and the synthesis of proteins and various other biochemicals necessary for digestion and growth.

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Local Group

The Local Group is the galaxy group that includes the Milky Way, where Earth is located.

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London

London is the capital and largest city of both England and the United Kingdom, with a population of in.

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London Underground

The London Underground (also known simply as the Underground or by its nickname the Tube) is a rapid transit system serving Greater London and some parts of the adjacent home counties of Buckinghamshire, Essex and Hertfordshire in England.

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Longwave

In radio, longwave, long wave or long-wave, and commonly abbreviated LW, refers to parts of the radio spectrum with wavelengths longer than what was originally called the medium-wave broadcasting band.

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Loop quantum gravity

Loop quantum gravity (LQG) is a theory of quantum gravity that incorporates matter of the Standard Model into the framework established for the intrinsic quantum gravity case.

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Los Angeles

Los Angeles, often referred to by its initials L.A., is the most populous city in the U.S. state of California.

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Louisiana

Louisiana (Louisiane; Luisiana; Lwizyàn) is a state in the Deep South and South Central regions of the United States.

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Low Earth orbit

A low Earth orbit (LEO) is an orbit around Earth with a period of 128 minutes or less (making at least 11.25 orbits per day) and an eccentricity less than 0.25.

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Lunar distance

The instantaneous Earth–Moon distance, or distance to the Moon, is the distance from the center of Earth to the center of the Moon.

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Luxor Obelisks

The Luxor Obelisks (French: Obélisques de Louxor) are a pair of ancient Egyptian obelisks, over 3,000 years old, carved to stand either side of the portal of the Luxor Temple in the reign of Ramesses II.

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Lyman-alpha

Lyman-alpha, typically denoted by Ly-α, is a spectral line of hydrogen (or, more generally, of any one-electron atom) in the Lyman series.

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Lysosome

A lysosome is a single membrane-bound organelle found in many animal cells.

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LZ 129 Hindenburg

LZ 129 Hindenburg (Luftschiff Zeppelin #129; Registration: D-LZ 129) was a German commercial passenger-carrying rigid airship, the lead ship of the ''Hindenburg'' class, the longest class of flying machine and the largest airship by envelope volume.

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Macrophage

Macrophages (abbreviated Mφ, MΦ or MP) are a type of white blood cell of the innate immune system that engulf and digest pathogens, such as cancer cells, microbes, cellular debris, and foreign substances, which do not have proteins that are specific to healthy body cells on their surface.

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Madrid Metro

The Madrid Metro (Spanish: Metro de Madrid) is a rapid transit system serving the city of Madrid, capital of Spain.

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Maffei 1

Maffei 1 is a massive elliptical galaxy in the constellation Cassiopeia.

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Major League Baseball

Major League Baseball (MLB) is a professional baseball league and the highest level of organized baseball in the United States and Canada.

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Malin 1

Malin 1 is a giant low surface brightness (LSB) spiral galaxy.

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Manhattan

Manhattan is the most densely populated and geographically smallest of the five boroughs of New York City.

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Marathon

The marathon is a long-distance foot race with a distance of, usually run as a road race, but the distance can be covered on trail routes.

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Mariana Trench

The Mariana Trench is an oceanic trench located in the western Pacific Ocean, about east of the Mariana Islands; it is the deepest oceanic trench on Earth.

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Mars

Mars is the fourth planet from the Sun.

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Marylebone Cricket Club

Marylebone Cricket Club (MCC) is a cricket club founded in 1787 and based since 1814 at Lord's Cricket Ground, which it owns, in St John's Wood, London.

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Matter wave

Matter waves are a central part of the theory of quantum mechanics, being half of wave–particle duality.

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Matterhorn

The italics (Cervino; Cervin; Mont(e) Cervin(u))There are several different Romansh dialects, each with its own slight variation on the name for the Matterhorn.

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Mauna Kea

Mauna Kea (abbreviation for Mauna a Wākea); is an inactive shield volcano on the island of Hawaiokinai.

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Mediterranean Sea

The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Southern Europe and Anatolia, on the south by North Africa, on the east by the Levant in West Asia, and on the west almost by the Morocco–Spain border.

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Melbourne

Melbourne (Boonwurrung/Narrm or Naarm) is the capital and most populous city of the Australian state of Victoria, and the second-most populous city in Australia, after Sydney.

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MEMS

MEMS (micro-electromechanical systems) is the technology of microscopic devices incorporating both electronic and moving parts.

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Mercury (planet)

Mercury is the first planet from the Sun and the smallest in the Solar System.

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Meridian (geography)

In geography and geodesy, a meridian is the locus connecting points of equal longitude, which is the angle (in degrees or other units) east or west of a given prime meridian (currently, the IERS Reference Meridian).

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Meridian arc

In geodesy and navigation, a meridian arc is the curve between two points on the Earth's surface having the same longitude.

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Meson

In particle physics, a meson is a type of hadronic subatomic particle composed of an equal number of quarks and antiquarks, usually one of each, bound together by the strong interaction.

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Mesoporous silica

Mesoporous silica is a form of silica that is characterised by its mesoporous structure, that is, having pores that range from 2 nm to 50 nm in diameter.

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Messier 13

Messier 13 or M13 (also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules, the Hercules Globular Cluster, or the Great Hercules Cluster), is a globular cluster of several hundred thousand stars in the constellation of Hercules.

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Messier 4

Messier 4 or M4 (also known as NGC 6121 or the Spider Globular Cluster) is a globular cluster in the constellation of Scorpius.

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Meteoroid

A meteoroid is a small rocky or metallic body in outer space.

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Metre

The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI).

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Metric prefix

A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit.

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Metric system

The metric system is a decimal-based system of measurement.

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Miami

Miami, officially the City of Miami, is a coastal city in the U.S. state of Florida and the seat of Miami-Dade County in South Florida.

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Michigan State University

Michigan State University (Michigan State or MSU) is a public land-grant research university in East Lansing, Michigan.

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Microchaetus rappi

Microchaetus rappi, the African giant earthworm, is a large earthworm in the family Microchaetidae, the largest of the segmented worms (commonly called earthworms).

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Microfilament

Microfilaments, also called actin filaments, are protein filaments in the cytoplasm of eukaryotic cells that form part of the cytoskeleton.

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Micrometre

The micrometre (Commonwealth English) as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American English), also commonly known by the non-SI term micron, is a unit of length in the International System of Units (SI) equalling (SI standard prefix "micro-".

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Microprocessor

A microprocessor is a computer processor for which the data processing logic and control is included on a single integrated circuit (IC), or a small number of ICs.

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Microsecond

A microsecond is a unit of time in the International System of Units (SI) equal to one millionth (0.000001 or 10−6 or) of a second.

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Microtubule

Microtubules are polymers of tubulin that form part of the cytoskeleton and provide structure and shape to eukaryotic cells.

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Mid-ocean ridge

A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics.

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Mil Mi-26

The Mil Mi-26 (Миль Ми-26, NATO reporting name: Halo) is a Soviet/Russian heavy transport helicopter. Its product code is Izdeliye 90. Operated by both military and civilian operators, it is the largest helicopter to have gone into serial production.

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Mile

The mile, sometimes the international mile or statute mile to distinguish it from other miles, is a British imperial unit and United States customary unit of distance; both are based on the older English unit of length equal to 5,280 English feet, or 1,760 yards.

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Milky Way

The Milky Way is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.

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Millau Viaduct

The Millau Viaduct (Viaduc de Millau) is a multispan cable-stayed bridge completed in 2004 across the gorge valley of the Tarn near (west of) Millau in the Aveyron department in the Occitanie Region, in Southern France.

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Millimetre

Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales. The microwave is between 1 meter to 1 '''millimeter'''. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

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Millisecond

A millisecond (from milli- and second; symbol: ms) is a unit of time in the International System of Units equal to one thousandth (0.001 or 10−3 or 1/1000) of a second or 1000 microseconds.

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Mini

The Mini (developed as ADO15) is a small, two-door, four-seat car produced by the British Motor Corporation (BMC) and its successors, from 1959 until 2000.

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Minor-planet moon

A minor-planet moon is an astronomical object that orbits a minor planet as its natural satellite.

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Minute and second of arc

A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol, is a unit of angular measurement equal to of one degree.

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Mira

Mira, designation Omicron Ceti (ο Ceti, abbreviated Omicron Cet, ο Cet), is a red-giant star estimated to be 200–300 light-years from the Sun in the constellation Cetus.

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Mira variable

Mira variables (named for the prototype star Mira) are a class of pulsating stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visual wavelengths.

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Miranda (moon)

Miranda, also designated Uranus V, is the smallest and innermost of Uranus's five round satellites.

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Mississippi River

The Mississippi River is the primary river and second-longest river of the largest drainage basin in the United States.

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Missouri River

The Missouri River is a river in the Central and Mountain West regions of the United States.

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Mont Blanc

Mont Blanc (BrE:; AmE:; Mont Blanc; Monte Bianco, both meaning "white mountain") is the highest mountain in the Alps and Western Europe, and the highest mountain in Europe outside the Caucasus mountains, rising above sea level, located on the Franco-Italian border.

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Moon

The Moon is Earth's only natural satellite.

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Moons of Jupiter

There are 95 moons of Jupiter with confirmed orbits.

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Mosquito

Mosquitoes, the Culicidae, are a family of small flies consisting of 3,600 species.

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Mount Damavand

Mount Damavand (دماوند) is a dormant stratovolcano and is the highest peak in Iran and Western Asia, the highest volcano in Asia, and the 3rd highest volcano in the Eastern Hemisphere (after Mount Kilimanjaro and Mount Elbrus), at an elevation of.

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Mount Elbrus

Mount Elbrus is the highest mountain in Russia and Europe.

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Mount Everest

Mount Everest is Earth's highest mountain above sea level, located in the Mahalangur Himal sub-range of the Himalayas.

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Mount Fuji

is an active stratovolcano located on the Japanese island of Honshu, with a summit elevation of.

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Mount Kilimanjaro

Mount Kilimanjaro is a dormant volcano in Tanzania.

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Mount Kosciuszko

Mount Kosciuszko (Ngarigo: Kunama Namadgi) is mainland Australia's tallest mountain, at above sea level.

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Mount Logan

Mount Logan is the highest mountain in Canada and the second-highest peak in North America after Denali.

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Mount Wilhelm

Mount Wilhelm (Wilhelmsberg) is the highest mountain in Papua New Guinea at.

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Mountain range

A mountain range or hill range is a series of mountains or hills arranged in a line and connected by high ground.

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Mu Cephei

Mu Cephei (Latinized from μ Cephei, abbreviated Mu Cep or μ Cep), also known as Herschel's Garnet Star, Erakis, or HD 206936, is a red supergiant or hypergiant star in the constellation Cepheus.

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Mumbai

Mumbai (ISO:; formerly known as Bombay) is the capital city of the Indian state of Maharashtra.

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Munda Biddi Trail

The Munda Biddi Trail is a long-distance mostly off-road cycling trail in Western Australia.

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Mute swan

The mute swan (Cygnus olor) is a species of swan and a member of the waterfowl family Anatidae.

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Mycoplasma

Mycoplasma is a genus of bacteria that, like the other members of the class Mollicutes, lack a cell wall, and its peptidoglycan, around their cell membrane.

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Myria-

Myria- (symbol my) is a now obsolete decimal metric prefix denoting a factor of 104 (ten thousand).

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Naiad (moon)

Naiad, (also known as Neptune III and previously designated as S/1989 N 6) named after the naiads of Greek legend, is the innermost satellite of Neptune and the nearest to the center of any gas giant with moons with a distance of 48,224 km from the planet's center.

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Naked eye

Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying, light-collecting optical instrument, such as a telescope or microscope, or eye protection.

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Namib

The Namib (Namibe) is a coastal desert in Southern Africa.

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Nanobe

A nanobe is a tiny filamental structure first found in some rocks and sediments.

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Nanometre

molecular scale. The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm), or nanometer (American spelling), is a unit of length in the International System of Units (SI), equal to one billionth (short scale) of a meter (0.000000001 m) and to 1000 picometres.

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Nanosecond

A nanosecond (ns) is a unit of time in the International System of Units (SI) equal to one billionth of a second, that is, of a second, or 10 seconds.

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Nanowire

doi-access.

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NASA

The National Aeronautics and Space Administration (NASA) is an independent agency of the U.S. federal government responsible for the civil space program, aeronautics research, and space research.

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Nashik

Nashik, Marathi: naːʃik, formerly Nasik) is a city in the northern region of the Indian state of Maharashtra.

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National Highways Development Project

The National Highways Development Project (NHDP) was a project of four laning of existing national highways and six laning of selected major national highways of India.

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National highways of India

The national highways in India are a network of limited access roads owned by the Ministry of Road Transport and Highways.

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National Institute of Standards and Technology

The National Institute of Standards and Technology (NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness.

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Natural satellite

A natural satellite is, in the most common usage, an astronomical body that orbits a planet, dwarf planet, or small Solar System body (or sometimes another natural satellite).

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Nautical mile

A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters.

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Nepal

Nepal, officially the Federal Democratic Republic of Nepal, is a landlocked country in South Asia.

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Neptune

Neptune is the eighth and farthest known planet from the Sun.

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Nereid (moon)

Nereid, or Neptune II, is the third-largest moon of Neptune.

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Neso (moon)

Neso, also known as Neptune XIII, is the second-outermost known natural satellite of Neptune, after S/2021 N 1.

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Neutron

| magnetic_moment.

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Neutron star

A neutron star is the collapsed core of a massive supergiant star.

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New York City

New York, often called New York City (to distinguish it from New York State) or NYC, is the most populous city in the United States.

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NGC 2419

NGC 2419 (also known as Caldwell 25) is a globular cluster in the constellation Lynx.

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NGC 4889

NGC 4889 (also known as Caldwell 35) is an E4 supergiant elliptical galaxy.

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NGC 604

NGC 604 is an H II region inside the Triangulum Galaxy.

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NGC 6946

NGC 6946, sometimes referred to as the Fireworks Galaxy, is a face-on intermediate spiral galaxy with a small bright nucleus, whose location in the sky straddles the boundary between the northern constellations of Cepheus and Cygnus. Its distance from Earth is about 25.2 million light-years or 7.72 megaparsecs, similar to the distance of M101 (NGC 5457) in the constellation Ursa Major.

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Niagara Falls

Niagara Falls is a group of three waterfalls at the southern end of Niagara Gorge, spanning the border between the province of Ontario in Canada and the state of New York in the United States.

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Nile

The Nile (also known as the Nile River) is a major north-flowing river in northeastern Africa.

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Norden, Lower Saxony

Norden (East Frisian Low Saxon: Nörden) is a town in the district of Aurich, in Lower Saxony, Germany.

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North America

North America is a continent in the Northern and Western Hemispheres.

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North Pole

The North Pole, also known as the Geographic North Pole, Terrestrial North Pole or 90th Parallel North, is the point in the Northern Hemisphere where the Earth's axis of rotation meets its surface.

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North Sea

The North Sea lies between Great Britain, Denmark, Norway, Germany, the Netherlands, Belgium and France.

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Norway

Norway (Norge, Noreg), formally the Kingdom of Norway, is a Nordic country in Northern Europe, situated on the Scandinavian Peninsula.

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Nuclear physics

Nuclear physics is the field of physics that studies atomic nuclei and their constituents and interactions, in addition to the study of other forms of nuclear matter.

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Nucleon

In physics and chemistry, a nucleon is either a proton or a neutron, considered in its role as a component of an atomic nucleus.

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Observable universe

The observable universe is a ball-shaped region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion.

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Oceania

Oceania is a geographical region including Australasia, Melanesia, Micronesia, and Polynesia.

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OGLE-2005-BLG-390Lb

OGLE-2005-BLG-390Lb (known sometimes as Hoth by NASA) is a super-Earth exoplanet orbiting OGLE-2005-BLG-390L, a star from Earth near the center of the Milky Way, making it one of the most distant planets known.

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OGLE-TR-122

OGLE-TR-122 is a binary stellar system containing one of the smallest main-sequence stars whose radius has been measured.

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OGLE-TR-56

OGLE-TR-56 is a dim, distant, magnitude 17 Sun-like star located approximately away in the constellation of Sagittarius.

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Okapi

The okapi (Okapia johnstoni), also known as the forest giraffe, Congolese giraffe and zebra giraffe, is an artiodactyl mammal that is endemic to the northeast Democratic Republic of the Congo in central Africa.

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Okinawa Prefecture

is the southernmost and westernmost prefecture of Japan.

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Olympus Mons

Olympus Mons (Mount Olympus) is a large shield volcano on Mars.

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Om (river)

The Om is a river in the south of the Western Siberian plains in Russia.

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Omega Centauri

Omega Centauri (ω Cen, NGC 5139, or Caldwell 80) is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677.

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Oort cloud

The Oort cloud, sometimes called the Öpik–Oort cloud, is theorized to be a vast cloud of icy planetesimals surrounding the Sun at distances ranging from 2,000 to 200,000 AU (0.03 to 3.2 light-years).

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Orange (colour)

Orange is the colour between yellow and red on the spectrum of visible light.

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Orbit

In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such as a planet, moon, asteroid, or Lagrange point.

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Order of magnitude

An order of magnitude is an approximation of the logarithm of a value relative to some contextually understood reference value, usually 10, interpreted as the base of the logarithm and the representative of values of magnitude one. Orders of magnitude (length) and order of magnitude are orders of magnitude.

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Orders of magnitude (area)

This page is a progressive and labelled list of the SI area orders of magnitude, with certain examples appended to some list objects. Orders of magnitude (length) and orders of magnitude (area) are orders of magnitude.

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Orders of magnitude (length)

The following are examples of orders of magnitude for different lengths. Orders of magnitude (length) and orders of magnitude (length) are length, lists by length and orders of magnitude.

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Orders of magnitude (temperature)

Most ordinary human activity takes place at temperatures of this order of magnitude. Orders of magnitude (length) and orders of magnitude (temperature) are orders of magnitude.

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Orders of magnitude (volume)

The table lists various objects and units by the order of magnitude of their volume. Orders of magnitude (length) and orders of magnitude (volume) are orders of magnitude.

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Orion Nebula

The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the constellation of Orion, and is known as the middle "star" in the "sword" of Orion.

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Outer space

Outer space (or simply space) is the expanse that exists beyond Earth's atmosphere and between celestial bodies.

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Paedocypris progenetica

Paedocypris progenetica, the dwarf goby, is a species of tiny cyprinid fish endemic to the Indonesian islands of Sumatra and Bintan where it is found in peat swamps and blackwater streams.

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Paint

Paint is a material or mixture that, when applied to a solid material and allowed to dry, adds a film-like layer.

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Pale Blue Dot

Pale Blue Dot is a photograph of Earth taken on February 14, 1990, by the Voyager 1 space probe from an unprecedented distance of approximately kilometers (miles, 40.5 AU), as part of that day's ''Family Portrait'' series of images of the Solar System.

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Palm Jebel Ali

Palm Jebel Ali is an artificial archipelago in Dubai, United Arab Emirates.

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Pan (moon)

Pan is the innermost named moon of Saturn.

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Panama Canal

The Panama Canal (Canal de Panamá) is an artificial waterway in Panama that connects the Atlantic Ocean with the Pacific Ocean, cutting across the Isthmus of Panama, and is a conduit for maritime trade.

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Panzer VIII Maus

Panzerkampfwagen VIII Maus (English: 'mouse') is a German World War II super-heavy tank completed in July of 1944.

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Papua New Guinea

Papua New Guinea, officially the Independent State of Papua New Guinea, is a country in Oceania that comprises the eastern half of the island of New Guinea and its offshore islands in Melanesia (a region of the southwestern Pacific Ocean north of Australia).

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Paraceratherium

Paraceratherium is an extinct genus of hornless rhinocerotoids belonging to the family Paraceratheriidae.

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Paramecium

Paramecium (plural "paramecia" only when used as a vernacular name) is a genus of eukaryotic, unicellular ciliates, widespread in freshwater, brackish, and marine environments.

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Parasang

The parasang, also known as a farsakh (from Arabic), is a historical Iranian unit of walking distance, the length of which varied according to terrain and speed of travel.

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Paris

Paris is the capital and largest city of France.

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Paris Métro

The Paris Métro (Métro de Paris; short for Métropolitain), operated by the Régie autonome des transports parisiens (RATP), is a rapid transit system in the Paris metropolitan area, France.

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Paris–Brest–Paris

Paris–Brest–Paris (PBP) is a long-distance cycling event.

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Parsec

The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to or (AU), i.e..

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Particle accelerator

A particle accelerator is a machine that uses electromagnetic fields to propel charged particles to very high speeds and energies to contain them in well-defined beams.

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Particle horizon

The particle horizon (also called the cosmological horizon, the comoving horizon (in Scott Dodelson's text), or the cosmic light horizon) is the maximum distance from which light from particles could have traveled to the observer in the age of the universe.

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Particle physics

Particle physics or high-energy physics is the study of fundamental particles and forces that constitute matter and radiation.

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Peel P50

The Peel P50 is a three-wheeled microcar originally made from 1962 to 1965 by the Peel Engineering Company on the Isle of Man, and then from 2010 to present. It was listed in the 2010 Guinness World Records as the smallest production car ever made. The original model has no reverse gear, but a handle at the rear allows the very lightweight car to be maneuvered physically when required.

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Pegasus (constellation)

Pegasus is a constellation in the northern sky, named after the winged horse Pegasus in Greek mythology.

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Pelagornis

Pelagornis is a widespread genus of prehistoric pseudotooth birds.

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Perseus Arm

The Perseus Arm is one of two major spiral arms of the Milky Way galaxy.

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Phobos (moon)

Phobos (systematic designation) is the innermost and larger of the two natural satellites of Mars, the other being Deimos.

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Phoebe (moon)

Phoebe is the most massive irregular satellite of Saturn with a mean diameter of.

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Phospholipid

Phospholipids are a class of lipids whose molecule has a hydrophilic "head" containing a phosphate group and two hydrophobic "tails" derived from fatty acids, joined by an alcohol residue (usually a glycerol molecule).

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Physical cosmology

Physical cosmology is a branch of cosmology concerned with the study of cosmological models.

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Physics

Physics is the natural science of matter, involving the study of matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force.

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Pi

The number (spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.

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Piano

The piano is a keyboard instrument that produces sound when its keys are depressed, through engagement of an action whose hammers strike strings.

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Picometre

The picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the International System of Units (SI), equal to, or one trillionth of a metre, which is the SI base unit of length.

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Picosecond

A picosecond (abbreviated as ps) is a unit of time in the International System of Units (SI) equal to 10−12 or (one trillionth) of a second.

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Pine

A pine is any conifer tree or shrub in the genus Pinus of the family Pinaceae.

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Pinus lambertiana

Pinus lambertiana (commonly known as the sugar pine or sugar cone pine) is the tallest and most massive pine tree, and has the longest cones of any conifer.

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Pinwheel Galaxy

The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on, unbarred, and counterclockwise spiral galaxy located from Earth in the constellation Ursa Major.

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Pion

In particle physics, a pion or pi meson, denoted with the Greek letter pi, is any of three subatomic particles:,, and.

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Pioneer 10

Pioneer 10 (originally designated Pioneer F) is a NASA space probe launched in 1972 that completed the first mission to the planet Jupiter.

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Pioneer 11

Pioneer 11 (also known as Pioneer G) is a NASA robotic space probe launched on April 5, 1973, to study the asteroid belt, the environment around Jupiter and Saturn, the solar wind, and cosmic rays.

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Pisces–Cetus Supercluster Complex

The Pisces–Cetus Supercluster Complex is a galaxy filament.

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Pistol Star

The Pistol Star is an extremely luminous blue hypergiant star, one of the most luminous and massive known in the Milky Way.

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Pixel

In digital imaging, a pixel (abbreviated px), pel, or picture element is the smallest addressable element in a raster image, or the smallest addressable element in a dot matrix display device.

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Planck (spacecraft)

Planck was a space observatory operated by the European Space Agency (ESA) from 2009 to 2013.

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Planet

A planet is a large, rounded astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself.

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Pluto

Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune.

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Pollux (star)

Pollux is the brightest star in the constellation of Gemini.

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Popular Mechanics

Popular Mechanics (often abbreviated as PM or PopMech) is a magazine of popular science and technology, featuring automotive, home, outdoor, electronics, science, do it yourself, and technology topics.

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Porcine circovirus

Porcine circovirus (PCV) is a group of four single-stranded DNA viruses that are non-enveloped with an unsegmented circular genome.

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Preon

In particle physics, preons are hypothetical point particles, conceived of as sub-components of quarks and leptons.

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Protein

Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues.

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Proteus (moon)

Proteus, also known as Neptune VIII, is the second-largest Neptunian moon, and Neptune's largest inner satellite.

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Proton

A proton is a stable subatomic particle, symbol, H+, or 1H+ with a positive electric charge of +1 e (elementary charge).

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Proxima Centauri

Proxima Centauri is a small, low-mass star located away from the Sun in the southern constellation of Centaurus.

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Prudhoe Bay, Alaska

Prudhoe Bay is a census-designated place (CDP) located in North Slope Borough in the U.S. state of Alaska.

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PSR B1257+12

PSR B1257+12, previously designated PSR 1257+12, alternatively designated PSR J1300+1240, is a millisecond pulsar located from the Sun in the constellation of Virgo, rotating at about 161 times per second (faster than a blender's blade).

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PSR B1620−26 b

PSR B1620-26 b is an exoplanet located approximately 12,400 light-years from Earth in the constellation of Scorpius.

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PSR B1919+21

PSR B1919+21 is a pulsar with a period of 1.3373 seconds and a pulse width of 0.04 seconds.

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Pune

Pune, previously spelled in English as Poona (the official name until 1978), is a city in Maharashtra state in the Deccan plateau in Western India.

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Pyramid of Djoser

The pyramid of Djoser (or Djeser and Zoser), sometimes called the Step Pyramid of Djoser, is an archaeological site in the Saqqara necropolis, Egypt, northwest of the ruins of Memphis.

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Pyrenees

The Pyrenees are a mountain range straddling the border of France and Spain.

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Qatar

Qatar (قطر) officially the State of Qatar, is a country in West Asia. It occupies the Qatar Peninsula on the northeastern coast of the Arabian Peninsula in the Middle East; it shares its sole land border with Saudi Arabia to the south, with the rest of its territory surrounded by the Persian Gulf.

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Quantum foam

Quantum foam or spacetime foam is a theoretical quantum fluctuation of spacetime on very small scales due to quantum mechanics.

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Quaoar

Quaoar (minor-planet designation: 50000 Quaoar) is a large, ringed dwarf planet in the Kuiper belt, a region of icy planetesimals beyond Neptune.

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Quark

A quark is a type of elementary particle and a fundamental constituent of matter.

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Quartz

Quartz is a hard, crystalline mineral composed of silica (silicon dioxide).

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Quasar

A quasar is an extremely luminous active galactic nucleus (AGN).

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Quasi-star

A quasi-star (also called black hole star) is a hypothetical type of extremely massive and luminous star that may have existed early in the history of the Universe.

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Queen Alexandra's birdwing

Ornithoptera alexandrae, the Queen Alexandra's birdwing, is the largest species of butterfly in the world, with females reaching wingspans slightly in excess of 25 cm to 28 cm (9.8 inches to 11 inches).

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Quetzalcoatlus

Quetzalcoatlus is a genus of azhdarchid pterosaur known from the Late Cretaceous Maastrichtian age of North America.

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Quintal

The quintal or centner is a historical unit of mass in many countries which is usually defined as 100 base units, such as pounds or kilograms.

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Rabies

Rabies is a viral disease that causes encephalitis in humans and other mammals.

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Rafflesia arnoldii

Rafflesia arnoldii, the corpse flower, or giant padma, is a species of flowering plant in the parasitic genus Rafflesia.

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Rail transport

Rail transport (also known as train transport) is a means of transport using wheeled vehicles running in tracks, which usually consist of two parallel steel rails.

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Rapier

A rapier or espada ropera is a type of sword originally used in Renaissance Spain.

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Red

Red is the color at the long wavelength end of the visible spectrum of light, next to orange and opposite violet.

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Red blood cell

Red blood cells (RBCs), referred to as erythrocytes (with -cyte translated as 'cell' in modern usage) in academia and medical publishing, also known as red cells, erythroid cells, and rarely haematids, are the most common type of blood cell and the vertebrate's principal means of delivering oxygen to the body tissues—via blood flow through the circulatory system.

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Red clump

The red clump is a clustering of red giants in the Hertzsprung–Russell diagram at around 5,000 K and absolute magnitude (MV) +0.5, slightly hotter than most red-giant-branch stars of the same luminosity.

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Red dwarf

A red dwarf is the smallest kind of star on the main sequence.

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Red giant

A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.

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Red Sea

The Red Sea is a sea inlet of the Indian Ocean, lying between Africa and Asia.

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Red supergiant

Red supergiants (RSGs) are stars with a supergiant luminosity class (Yerkes class I) and a stellar classification K or M. They are the largest stars in the universe in terms of volume, although they are not the most massive or luminous.

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Red-giant branch

The red-giant branch (RGB), sometimes called the first giant branch, is the portion of the giant branch before helium ignition occurs in the course of stellar evolution.

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Redshift

In physics, a redshift is an increase in the wavelength, and corresponding decrease in the frequency and photon energy, of electromagnetic radiation (such as light).

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Regulus

Regulus is the brightest object in the constellation Leo and one of the brightest stars in the night sky.

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Rensselaer Polytechnic Institute

Rensselaer Polytechnic Institute (RPI) is a private research university in Troy, New York, with an additional campus in Hartford, Connecticut.

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Rho Cassiopeiae

Rho Cassiopeiae (ρ Cas, ρ Cassiopeiae) is a yellow hypergiant star in the constellation Cassiopeia.

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Rhode Island

Rhode Island (pronounced "road") is a state in the New England region of the Northeastern United States.

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Rigel

Rigel is a blue supergiant star in the constellation of Orion.

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Road train

A road train, also known as a land train or long combination vehicle (LCV) is a semi-truck used to move road freight more efficiently than single-trailer semi-trucks.

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Robert Wadlow

Robert Pershing Wadlow (February 22, 1918 July 15, 1940), also known as the Alton Giant and the Giant of Illinois, was an American man who was the tallest person in recorded history for whom there is irrefutable evidence.

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Rome

Rome (Italian and Roma) is the capital city of Italy.

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Russia

Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia.

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Ruthenium

Ruthenium is a chemical element; it has symbol Ru and atomic number 44.

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Rwanda

Rwanda, officially the Republic of Rwanda, is a landlocked country in the Great Rift Valley of Central Africa, where the African Great Lakes region and Southeast Africa converge. Located a few degrees south of the Equator, Rwanda is bordered by Uganda, Tanzania, Burundi, and the Democratic Republic of the Congo.

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Sagittarius A*

Sagittarius A*, abbreviated as Sgr A*, is the supermassive black hole at the Galactic Center of the Milky Way.

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Sagittarius Dwarf Spheroidal Galaxy

The Sagittarius Dwarf Spheroidal Galaxy (Sgr dSph), also known as the Sagittarius Dwarf Elliptical Galaxy (Sgr dE or Sag DEG), is an elliptical loop-shaped satellite galaxy of the Milky Way.

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Saguaro

The saguaro (Carnegiea gigantea) is a tree-like cactus species in the monotypic genus Carnegiea that can grow to be over tall.

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Sahara

The Sahara is a desert spanning across North Africa.

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Salt

In common usage, salt is a mineral composed primarily of sodium chloride (NaCl).

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San Diego

San Diego is a city on the Pacific Ocean coast in Southern California located immediately adjacent to the Mexico–United States border.

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San Francisco

San Francisco, officially the City and County of San Francisco, is a commercial, financial, and cultural center in Northern California.

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Sand

Sand is a granular material composed of finely divided mineral particles.

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Satellite galaxy

A satellite galaxy is a smaller companion galaxy that travels on bound orbits within the gravitational potential of a more massive and luminous host galaxy (also known as the primary galaxy).

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Saturn

Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.

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Saturn V

The Saturn V is a retired American super heavy-lift launch vehicle developed by NASA under the Apollo program for human exploration of the Moon.

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Sauroposeidon

Sauroposeidon (meaning "lizard earthquake god", after the Greek god Poseidon) is a genus of sauropod dinosaur known from several incomplete specimens including a bone bed and fossilized trackways that have been found in the U.S. states of Oklahoma, Wyoming, and Texas.

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Scandinavian mile

A Scandinavian mile (Norwegian and mil,, peninkulma) is a unit of length common in Norway and Sweden, to a lesser extent in Finland, but not Denmark.

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Schwarzschild radius

The Schwarzschild radius or the gravitational radius is a physical parameter in the Schwarzschild solution to Einstein's field equations that corresponds to the radius defining the event horizon of a Schwarzschild black hole.

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Scientific American

Scientific American, informally abbreviated SciAm or sometimes SA, is an American popular science magazine.

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Scud missile

A Scud missile is one of a series of tactical ballistic missiles developed by the Soviet Union during the Cold War.

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Sculptor Galaxy

The Sculptor Galaxy (also known as the Silver Coin Galaxy, Silver Dollar Galaxy, NGC 253, or Caldwell 65) is an intermediate spiral galaxy in the constellation Sculptor.

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Sculptor Group

The Sculptor Group is a loose group of galaxies visible near the south galactic pole.

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SEA-ME-WE 3

SEA-ME-WE3 or South-East Asia - Middle East - Western Europe 3 is an optical submarine telecommunications cable linking those regions and is the longest in the world.

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Seawise Giant

The TT Seawise Giant—earlier Oppama; later Happy Giant, Jahre Viking, Knock Nevis, and Mont—was a ULCC supertanker and the longest self-propelled ship in history, built in 1974–1979 by Sumitomo Heavy Industries in Yokosuka, Kanagawa, Japan.

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Second

The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60.

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Sedna (dwarf planet)

Sedna (minor-planet designation: 90377 Sedna) is a dwarf planet in the outermost reaches of the Solar System, orbiting the Sun beyond the orbit of Neptune.

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Seikan Tunnel

The Seikan Tunnel (青函トンネル, or 青函隧道) is a dual-gauge railway tunnel in Japan, with a portion under the seabed of the Tsugaru Strait, which separates Aomori Prefecture on the main Japanese island of Honshu from the northern island of Hokkaido.

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Semiconductor device fabrication

Semiconductor device fabrication is the process used to manufacture semiconductor devices, typically integrated circuits (ICs) such as computer processors, microcontrollers, and memory chips (such as NAND flash and DRAM).

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Shape of the universe

In physical cosmology, the shape of the universe refers to both its local and global geometry.

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Shapley Supercluster

The Shapley Supercluster or Shapley Concentration (SCl 124) is the largest concentration of galaxies in our nearby universe that forms a gravitationally interacting unit, thereby pulling itself together instead of expanding with the universe.

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SI base unit

The SI base units are the standard units of measurement defined by the International System of Units (SI) for the seven base quantities of what is now known as the International System of Quantities: they are notably a basic set from which all other SI units can be derived.

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Sicily

Sicily (Sicilia,; Sicilia,, officially Regione Siciliana) is an island in the central Mediterranean Sea, south of the Italian Peninsula in continental Europe and is one of the 20 regions of Italy.

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Silk

Silk is a natural protein fiber, some forms of which can be woven into textiles.

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Silt

Silt is granular material of a size between sand and clay and composed mostly of broken grains of quartz.

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Silver

Silver is a chemical element; it has symbol Ag (derived from Proto-Indo-European ''*h₂erǵ'')) and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite.

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Singapore

Singapore, officially the Republic of Singapore, is an island country and city-state in maritime Southeast Asia.

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Sirius

Sirius is the brightest star in the night sky.

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Skin

Skin is the layer of usually soft, flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation.

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Sky Tower (Auckland)

The Sky Tower is a telecommunications and observation tower in Auckland, New Zealand.

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Sloan Great Wall

The Sloan Great Wall (SGW) is a cosmic structure formed by a giant wall of galaxies (a galaxy filament).

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Small Magellanic Cloud

The Small Magellanic Cloud (SMC) is a dwarf galaxy near the Milky Way.

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Smoke

Smoke is a suspension of airborne particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass.

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SN 1987A

SN 1987A was a type II supernova in the Large Magellanic Cloud, a dwarf satellite galaxy of the Milky Way.

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Snowy albatross

The snowy albatross (Diomedea exulans), also known as the white-winged albatross, wandering albatross, or goonie, is a large seabird from the family Diomedeidae; they have a circumpolar range in the Southern Ocean.

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Sodium chloride

Sodium chloride, commonly known as edible salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chlorine ions.

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Sognefjord

The Sognefjord or Sognefjorden (Sogn Fjord), nicknamed the King of the Fjords (Fjordenes konge), is the largest and deepest fjord in Norway.

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Solar analog

Solar-type stars, solar analogs (also analogues), and solar twins are stars that are particularly similar to the Sun.

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Solar cell

A solar cell or photovoltaic cell (PV cell) is an electronic device that converts the energy of light directly into electricity by means of the photovoltaic effect.

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Solar mass

The solar mass is a standard unit of mass in astronomy, equal to approximately.

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Solar System

The Solar SystemCapitalization of the name varies.

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Sombrero Galaxy

The Sombrero Galaxy (also known as Messier Object 104, M104 or NGC 4594) is a peculiar galaxy of unclear classification in the constellation borders of Virgo and Corvus, being about from the Milky Way galaxy.

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South America

South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere.

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Space

Space is a three-dimensional continuum containing positions and directions.

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Spaceflight

Spaceflight (or space flight) is an application of astronautics to fly objects, usually spacecraft, into or through outer space, either with or without humans on board.

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Spain

Spain, formally the Kingdom of Spain, is a country located in Southwestern Europe, with parts of its territory in the Atlantic Ocean, the Mediterranean Sea and Africa.

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Spatial scale

Spatial scale is a specific application of the term scale for describing or categorizing (e.g. into orders of magnitude) the size of a space (hence spatial), or the extent of it at which a phenomenon or process occurs. Orders of magnitude (length) and spatial scale are length.

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Speed of light

The speed of light in vacuum, commonly denoted, is a universal physical constant that is exactly equal to). According to the special theory of relativity, is the upper limit for the speed at which conventional matter or energy (and thus any signal carrying information) can travel through space.

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Speed of sound

The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium.

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Sperm

Sperm (sperm or sperms) is the male reproductive cell, or gamete, in anisogamous forms of sexual reproduction (forms in which there is a larger, female reproductive cell and a smaller, male one).

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Sperm whale

The sperm whale or cachalot (Physeter macrocephalus) is the largest of the toothed whales and the largest toothed predator.

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Spermatozoon

A spermatozoon (also spelled spermatozoön;: spermatozoa) is a motile sperm cell, or moving form of the haploid cell that is the male gamete.

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Sphere

A sphere (from Greek) is a geometrical object that is a three-dimensional analogue to a two-dimensional circle.

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Spider silk

Spider silk is a protein fibre or silk spun by spiders.

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Spiral arm

Spiral arms are a defining feature of spiral galaxies.

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Split Point Lighthouse

Split Point Lighthouse is a lighthouse located in Aireys Inlet, a small town on the Great Ocean Road, Victoria, Australia.

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Square

In Euclidean geometry, a square is a regular quadrilateral, which means that it has four sides of equal length and four equal angles (90-degree angles, π/2 radian angles, or right angles).

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Square kilometre

The square kilometre (square kilometer in American spelling; symbol: km2) is a multiple of the square metre, the SI unit of area or surface area.

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St. John's, Newfoundland and Labrador

St.

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Star

A star is a luminous spheroid of plasma held together by self-gravity.

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Starr Bumble Bee II

The Starr Bumble Bee II is an experimental aircraft designed and built specifically to acquire the title of “The World’s Smallest Airplane”.

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Statue of Liberty

The Statue of Liberty (Liberty Enlightening the World) is a colossal neoclassical sculpture on Liberty Island in New York Harbor, within New York City.

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Statue of Unity

The Statue of Unity is the world's tallest statue, with a height of, located near Kevadia in the state of Gujarat, India.

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Stephan's Quintet

Stephan's Quintet is a visual grouping of five galaxies of which four form the first compact galaxy group ever discovered.

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Stere

The stere or stère (st) is a unit of volume in the original metric system equal to one cubic metre.

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Stingray Nebula

The Stingray Nebula (Hen 3-1357) is the youngest-known planetary nebula, having appeared in the 1980s.

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Stockholm

Stockholm is the capital and most populous city of the Kingdom of Sweden as well as the largest urban area in the Nordic countries.

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Strait of Dover

The Strait of Dover or Dover Strait (Pas de Calais - Strait of Calais) is the strait at the narrowest part of the English Channel, marking the boundary between the Channel and the North Sea, and separating Great Britain from continental Europe.

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Strait of Gibraltar

The Strait of Gibraltar is a narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates Europe from Africa.

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Strait of Messina

The Strait of Messina (Stretto di Messina; Strittu di Missina) is a narrow strait between the eastern tip of Sicily (Punta del Faro) and the western tip of Calabria (Punta Pezzo) in Southern Italy.

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Stratosphere

The stratosphere is the second-lowest layer of the atmosphere of Earth, located above the troposphere and below the mesosphere.

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String (physics)

In physics, a string is a physical entity postulated in string theory and related subjects.

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String theory

In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings.

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Strong interaction

In nuclear physics and particle physics, the strong interaction, also called the strong force or strong nuclear force, is a fundamental interaction that confines quarks into protons, neutrons, and other hadron particles.

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Sucrose

Sucrose, a disaccharide, is a sugar composed of glucose and fructose subunits.

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Suez Canal

The Suez Canal (قَنَاةُ ٱلسُّوَيْسِ) is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia (and by extension, the Sinai Peninsula from the rest of Egypt).

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Sugar

Sugar is the generic name for sweet-tasting, soluble carbohydrates, many of which are used in food.

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Sulfur

Sulfur (also spelled sulphur in British English) is a chemical element; it has symbol S and atomic number 16.

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Sun

The Sun is the star at the center of the Solar System.

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Sun-synchronous orbit

A Sun-synchronous orbit (SSO), also called a heliosynchronous orbit, is a nearly polar orbit around a planet, in which the satellite passes over any given point of the planet's surface at the same local mean solar time.

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Supercluster

A supercluster is a large group of smaller galaxy clusters or galaxy groups; they are among the largest known structures in the universe.

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Supermassive black hole

A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole, with its mass being on the order of hundreds of thousands, or millions to billions, of times the mass of the Sun.

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Supernova

A supernova (supernovae or supernovas) is a powerful and luminous explosion of a star.

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Supersaurus

Supersaurus (meaning "super lizard") is a genus of diplodocid sauropod dinosaur that lived in North America during the Late Jurassic period.

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Surgical mask

A surgical mask, also known by other names such as a medical face mask or procedure mask, is a personal protective equipment used by healthcare professionals that serves as a mechanical barrier that interferes with direct airflow in and out of respiratory orifices (i.e. nose and mouth).

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Suspension bridge

A suspension bridge is a type of bridge in which the deck is hung below suspension cables on vertical suspenders.

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Suzuka 1000 km

The Suzuka 1000km, also known as the Suzuka Summer Endurance Race, is an annual sports car endurance race that has been held at the Suzuka Circuit in Mie Prefecture, Japan since 1966.

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Sweden

Sweden, formally the Kingdom of Sweden, is a Nordic country located on the Scandinavian Peninsula in Northern Europe.

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Sydney

Sydney is the capital city of the state of New South Wales and the most populous city in Australia.

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Széchenyi Chain Bridge

The Széchenyi Chain Bridge (Széchenyi lánchíd) is a chain bridge that spans the River Danube between Buda and Pest, the western and eastern sides of Budapest, the capital of Hungary.

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T7 phage

Bacteriophage T7 (or the T7 phage) is a bacteriophage, a virus that infects bacteria.

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Taj Mahal

The Taj Mahal is an ivory-white marble mausoleum on the right bank of the river Yamuna in Agra, Uttar Pradesh, India.

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Tanggula Mountains

The Tanggula (Chinese:, p Tánggǔlāshān, or 唐古拉山脉, p Tánggǔlāshānmài), Tangla, Tanglha, or Dangla Mountains (Tibetan: གདང་ལ་།, w Gdang La, z Dang La) is a mountain range in the central part of the Qinghai-Tibet Plateau in Tibet.

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Tanggula Pass

The Tanggu La, Tangla Pass, or Tanggu Pass (གདང་ལ) is a wide mountain pass in Southwest China over in elevation, used by both the Qinghai–Tibet Highway and Qinghai–Tibet Railway to cross the Tanggula Mountains.

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Tau Ceti

Tau Ceti, Latinized from τ Ceti, is a single star in the constellation Cetus that is spectrally similar to the Sun, although it has only about 78% of the Sun's mass.

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Technetium

Technetium is a chemical element; it has symbol Tc and atomic number 43.

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Texas

Texas (Texas or Tejas) is the most populous state in the South Central region of the United States.

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The Astrophysical Journal

The Astrophysical Journal (ApJ) is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler.

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The New York Times Building

The New York Times Building is a 52-story skyscraper at 620 Eighth Avenue, between 40th and 41st Streets near Times Square, on the west side of Midtown Manhattan in New York City.

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The Sydney Morning Herald

The Sydney Morning Herald (SMH) is a daily tabloid newspaper published in Sydney, Australia, and owned by Nine.

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The World (archipelago)

The World Islands (Arabic: جزر العالم; Juzur al-Ālam) are an archipelago of small artificial islands constructed in the shape of a world map, located in the waters of the Persian Gulf, off the coast of Dubai, United Arab Emirates.

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Themisto (moon)

Themisto, also known as, is a small prograde irregular satellite of Jupiter.

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Thiomargarita namibiensis

Thiomargarita namibiensis is a harmless, gram-negative, facultative anaerobic, coccoid bacterium found in the ocean sediments of the continental shelf of Namibia.

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Thousandth of an inch

A thousandth of an inch is a derived unit of length in a system of units using inches.

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Three Gorges Dam

The Three Gorges Dam is a hydroelectric gravity dam that spans the Yangtze River near Sandouping in Yiling District, Yichang, Hubei province, central China, downstream of the Three Gorges.

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Thulium

Thulium is a chemical element; it has symbol Tm and atomic number 69.

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Titan (moon)

Titan is the largest moon of Saturn and the second-largest in the Solar System.

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Titanic

RMS Titanic was a British ocean liner that sank on 15 April 1912 as a result of striking an iceberg on her maiden voyage from Southampton, England to New York City, United States.

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Tobacco mosaic virus

Tobacco mosaic virus (TMV) is a positive-sense single-stranded RNA virus species in the genus Tobamovirus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae.

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Tonne

The tonne (or; symbol: t) is a unit of mass equal to 1,000 kilograms.

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Trans-Canada Highway

The Trans-Canada Highway (French: Route Transcanadienne; abbreviated as the TCH or T-Can) is a transcontinental federal–provincial highway system that travels through all ten provinces of Canada, from the Pacific Ocean on the west coast to the Atlantic Ocean on the east coast.

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Trans-Neptunian object

A trans-Neptunian object (TNO), also written transneptunian object, is any minor planet in the Solar System that orbits the Sun at a greater average distance than Neptune, which has an orbital semi-major axis of 30.1 astronomical units (au).

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Trans-Siberian Railway

The Trans-Siberian Railway, historically known as the Great Siberian Route and often shortened to Transsib, is a large railway system that connects European Russia to the Russian Far East.

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Transistor

A transistor is a semiconductor device used to amplify or switch electrical signals and power.

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TrES-4b

TrES-4b is an extrasolar planet, and one of the largest exoplanets ever found.

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Triton (moon)

Triton is the largest natural satellite of the planet Neptune.

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Troposphere

The troposphere is the lowest layer of the atmosphere of Earth.

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Tsuga heterophylla

Tsuga heterophylla, the western hemlock or western hemlock-spruce, is a species of hemlock native to the west coast of North America, with its northwestern limit on the Kenai Peninsula, Alaska, and its southeastern limit in northern Sonoma County, California.

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Tugela Falls

Tugela Falls (uThukela in Zulu) is a complex of seasonal waterfalls located in the Drakensberg (Dragon's Mountains) of Royal Natal National Park in KwaZulu-Natal Province, Republic of South Africa.

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Turkey

Turkey, officially the Republic of Türkiye, is a country mainly in Anatolia in West Asia, with a smaller part called East Thrace in Southeast Europe.

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Turn (biochemistry)

A turn is an element of secondary structure in proteins where the polypeptide chain reverses its overall direction.

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Twenty Thousand Leagues Under the Seas

Twenty Thousand Leagues Under the Seas (Vingt Mille Lieues sous les mers) is a science fiction adventure novel by the French writer Jules Verne.

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Twip

A twip (abbreviating "twentieth of a point" or "twentieth of an inch point") is a typographical measurement, defined as of a typographical point.

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U.S. Route 1

U.S. Route 1 or U.S. Highway 1 (US 1) is a major north–south United States Numbered Highway that serves the East Coast of the United States.

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Uganda

Uganda, officially the Republic of Uganda, is a landlocked country in East Africa.

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Ulm Minster

Ulm Minster (Ulmer Münster) is a Lutheran church located in Ulm, State of Baden-Württemberg (Germany).

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Ultra high frequency

Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter).

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Ultra-low particulate air

Ultra-low particulate air (ULPA) is a type of air filter.

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Ultraviolet

Ultraviolet (UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays.

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Ulysses (spacecraft)

Ulysses was a robotic space probe whose primary mission was to orbit the Sun and study it at all latitudes.

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Unit cell

In geometry, biology, mineralogy and solid state physics, a unit cell is a repeating unit formed by the vectors spanning the points of a lattice.

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Unit of measurement

A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.

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United States

The United States of America (USA or U.S.A.), commonly known as the United States (US or U.S.) or America, is a country primarily located in North America.

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United States Department of Commerce

The United States Department of Commerce (DOC) is an executive department of the U.S. federal government concerned with creating the conditions for economic growth and opportunity.

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Universe

The universe is all of space and time and their contents.

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University of California, Berkeley

The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public land-grant research university in Berkeley, California.

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University of California, San Diego

The University of California, San Diego (UC San Diego or colloquially, UCSD) is a public land-grant research university in San Diego, California.

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University of Nebraska–Lincoln

The University of Nebraska–Lincoln (Nebraska, NU, or UNL) is a public land-grant research university in Lincoln, Nebraska, United States.

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University of Wisconsin Press

The University of Wisconsin Press (sometimes abbreviated as UW Press) is a non-profit university press publishing peer-reviewed books and journals.

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Uranium

Uranium is a chemical element; it has symbol U and atomic number 92.

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Uranus

Uranus is the seventh planet from the Sun.

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Vacuum

A vacuum (vacuums or vacua) is space devoid of matter.

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Valles Marineris

Valles Marineris (Latin for Mariner Valleys, named after the Mariner 9 Mars orbiter of 1971–72 which discovered it) is a system of canyons that runs along the Martian surface east of the Tharsis region.

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Van der Waals radius

The van der Waals radius, r, of an atom is the radius of an imaginary hard sphere representing the distance of closest approach for another atom.

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Vega

Vega is the brightest star in the northern constellation of Lyra.

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Vela Pulsar

The Vela Pulsar (PSR J0835-4510 or PSR B0833-45) is a radio, optical, X-ray- and gamma-emitting pulsar associated with the Vela Supernova Remnant in the constellation of Vela.

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Venezuela

Venezuela, officially the Bolivarian Republic of Venezuela, is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in the Caribbean Sea.

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Venus

Venus is the second planet from the Sun.

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Victoria, British Columbia

Victoria is the capital city of the Canadian province of British Columbia, on the southern tip of Vancouver Island off Canada's Pacific coast.

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Vinson Massif

Vinson Massif is a large mountain massif in Antarctica that is long and wide and lies within the Sentinel Range of the Ellsworth Mountains.

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Violet (color)

Violet is the color of light at the short wavelength end of the visible spectrum.

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Violin

The violin, colloquially known as a fiddle, is a wooden chordophone, and is the smallest, and thus highest-pitched instrument (soprano) in regular use in the violin family.

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Virgo Cluster

The Virgo Cluster is a large cluster of galaxies whose center is 53.8 ± 0.3 Mly (16.5 ± 0.1 Mpc) away in the constellation Virgo.

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Virgo Supercluster

The Virgo Supercluster (Virgo SC) or the Local Supercluster (LSC or LS) was a formerly defined supercluster containing the Virgo Cluster and Local Group, which itself contains the Milky Way and Andromeda galaxies, as well as others.

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Virus

A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism.

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Visible spectrum

The visible spectrum is the band of the electromagnetic spectrum that is visible to the human eye.

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Vladivostok

Vladivostok (Владивосток) is the largest city and the administrative center of Primorsky Krai and the capital of the Far Eastern Federal District of Russia, located in the far east of Russia.

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Volga

The Volga (p) is the longest river in Europe. Situated in Russia, it flows through Central Russia to Southern Russia and into the Caspian Sea. The Volga has a length of, and a catchment area of., Russian State Water Registry It is also Europe's largest river in terms of average discharge at delta – between and – and of drainage basin.

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Volvo P1800

The Volvo P1800 (pronounced eighteen-hundred) is a 2+2, front-engine, rear-drive sports car manufactured and marketed by Volvo Cars between 1961 and 1973.

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Voyager 1

Voyager 1 is a space probe launched by NASA on September 5, 1977, as part of the Voyager program to study the outer Solar System and the interstellar space beyond the Sun's heliosphere.

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Voyager 2

Voyager 2 is a space probe launched by NASA on August 20, 1977, as a part of the Voyager program.

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VV Cephei

VV Cephei, also known as HD 208816, is an eclipsing binary star system located in the constellation Cepheus.

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VY Canis Majoris

VY Canis Majoris (abbreviated to VY CMa) is an extreme oxygen-rich red hypergiant or red supergiant (O-rich RHG or RSG) and pulsating variable star from the Solar System in the slightly southern constellation of Canis Major.

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Warsaw radio mast

The Warsaw Radio Mast (Maszt radiowy w Konstantynowie) was a radio mast located near Gąbin, Poland, and was the world's tallest structure at 2,120 ft (646.38 m) from 1974 until its collapse on 8 August 1991.

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Washington Monument

The Washington Monument is an obelisk on the National Mall in Washington, D.C., built to commemorate George Washington, a Founding Father of the United States, victorious commander-in-chief of the Continental Army from 1775 to 1783 in the American Revolutionary War, and the first President of the United States from 1789 to 1797.

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Washington, D.C.

Washington, D.C., formally the District of Columbia and commonly known as Washington or D.C., is the capital city and federal district of the United States.

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WASP-12b

WASP-12b is a hot Jupiter (a class of extrasolar planets) orbiting the star WASP-12, discovered in April of 2008, by the SuperWASP planetary transit survey.

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Water

Water is an inorganic compound with the chemical formula.

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Wavelength

In physics and mathematics, wavelength or spatial period of a wave or periodic function is the distance over which the wave's shape repeats. Orders of magnitude (length) and wavelength are length.

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Weak interaction

In nuclear physics and particle physics, the weak interaction, also called the weak force, is one of the four known fundamental interactions, with the others being electromagnetism, the strong interaction, and gravitation.

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West Virginia

West Virginia is a landlocked state in the Southern and Mid-Atlantic regions of the United States.

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Western Australia

Western Australia (WA) is a state of Australia occupying the western third of the land area of the Australian continent.

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Whale shark

The whale shark (Rhincodon typus) is a slow-moving, filter-feeding carpet shark and the largest known extant fish species.

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White blood cell

White blood cells (scientific name leukocytes), also called immune cells or immunocytes, are cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.

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White dwarf

A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter.

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White-nosed coati

The white-nosed coati (Nasua narica), also known as the coatimundi, is a species of coati and a member of the family Procyonidae (raccoons and their relatives).

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Wilkinson Microwave Anisotropy Probe

The Wilkinson Microwave Anisotropy Probe (WMAP), originally known as the Microwave Anisotropy Probe (MAP and Explorer 80), was a NASA spacecraft operating from 2001 to 2010 which measured temperature differences across the sky in the cosmic microwave background (CMB) – the radiant heat remaining from the Big Bang.

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Wool

Wool is the textile fiber obtained from sheep and other mammals, especially goats, rabbits, and camelids.

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World Athletics

World Athletics, formerly known as the International Amateur Athletic Federation and International Association of Athletics Federations and formerly abbreviated as the IAAF, is the international governing body for the sport of athletics, covering track and field, cross country running, road running, race walking, mountain running, and ultra running.

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World map

A world map is a map of most or all of the surface of Earth.

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World's littlest skyscraper

The Newby-McMahon Building, commonly referred to as the World's littlest skyscraper, is located at 511 7th Street (on the corner of Seventh and La Salle streets) in downtown Wichita Falls, Texas.

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X-ray

X-rays (or rarely, X-radiation) are a form of high-energy electromagnetic radiation.

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Xinhua News Agency

Xinhua News Agency (English pronunciation),J.

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Yangtze

Yangtze or Yangzi is the longest river in Eurasia, the third-longest in the world.

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Yard

The yard (symbol: yd) is an English unit of length in both the British imperial and US customary systems of measurement equalling 3 feet or 36 inches.

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Yeast

Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom.

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Yellow

Yellow is the color between green and orange on the spectrum of light.

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Yellow hypergiant

A yellow hypergiant (YHG) is a massive star with an extended atmosphere, a spectral class from A to K, and, starting with an initial mass of about 20–60 solar masses, has lost as much as half that mass.

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Yellow River

The Yellow River is the second-longest river in China, after the Yangtze; with an estimated length of it is the sixth-longest river system on Earth.

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Zirconium

Zirconium is a chemical element; it has symbol Zr and atomic number 40.

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10 nm process

In semiconductor fabrication, the International Technology Roadmap for Semiconductors (ITRS) defines the "10 nanometer process" as the MOSFET technology node following the "14 nm" node.

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1000 km Brands Hatch

The Brands Hatch 1000 km was an endurance sports car event that was part of the World Sportscar Championship for varying years from 1967 until 1989.

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1000 km Buenos Aires

The 1000 km Buenos Aires was an endurance sports car and stock car event held in Buenos Aires, Argentina.

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1000 km Zeltweg

The 4 Hours of Red Bull Ring (originally known as the 500 km Zeltweg) was an endurance sports car event held near Spielberg, Austria.

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14 nm process

The "14 nanometer process" refers to a marketing term for the MOSFET technology node that is the successor to the "22nbspnm" (or "20nm") node.

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1620 Geographos

1620 Geographos (provisional designation) is a highly elongated, stony asteroid, near-Earth object and potentially hazardous asteroid of the Apollo group, with a mean diameter of approximately.

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1931 Dogger Bank earthquake

The Dogger Bank earthquake of 1931 is the strongest earthquake recorded in the United Kingdom since measurements began.

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2008 HJ

2008 HJ is a sub-kilometer asteroid, classified as near-Earth object of the Apollo group.

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2008 TC3

(Catalina Sky Survey temporary designation 8TA9D69) was an, diameter asteroid that entered Earth's atmosphere on October 7, 2008.

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22 nm process

The "22 nm" node is the process step following 32 nm in CMOS MOSFET semiconductor device fabrication.

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24 Hours of Le Mans

The 24 Hours of Le Mans (24 Heures du Mans) is an endurance-focused sports car race held annually near the town of Le Mans, France.

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243 Ida

Ida, minor planet designation 243 Ida, is an asteroid in the Koronis family of the asteroid belt.

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25143 Itokawa

25143 Itokawa (provisional designation) is a sub-kilometer near-Earth object of the Apollo group and a potentially hazardous asteroid.

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2dF Galaxy Redshift Survey

In astronomy, the 2dF Galaxy Redshift Survey (Two-degree-Field Galaxy Redshift Survey), 2dF or 2dFGRS is a redshift survey conducted by the Australian Astronomical Observatory (AAO) with the 3.9m Anglo-Australian Telescope between 1997 and 11 April 2002.

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3-sphere

In mathematics, a 3-sphere, glome or hypersphere is a higher-dimensional analogue of a sphere.

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32 nm process

The "32 nm" node is the step following the "45 nm" process in CMOS (MOSFET) semiconductor device fabrication.

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3753 Cruithne

3753 Cruithne is a Q-type, Aten asteroid in orbit around the Sun in 1:1 orbital resonance with Earth, making it a co-orbital object.

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3C 273

3C 273 is a quasar located at the center of a giant elliptical galaxy in the constellation of Virgo.

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4 Hours of Silverstone

The 4 Hours of Silverstone (formerly the 1000 km of Silverstone and 6 Hours of Silverstone) is an endurance sports car race held at Silverstone Circuit near the Northamptonshire villages of Silverstone and Whittlebury.

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4 Vesta

Vesta (minor-planet designation: 4 Vesta) is one of the largest objects in the asteroid belt, with a mean diameter of.

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5.56×45mm NATO

The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO, commonly pronounced "five-five-six") is a rimless bottlenecked centerfire intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal.

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51 Pegasi

51 Pegasi (abbreviated 51 Peg), formally named Helvetios, is a Sun-like star located from Earth in the constellation of Pegasus.

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5535 Annefrank

5535 Annefrank, provisional designation, is a stony Florian asteroid and suspected contact binary from the inner asteroid belt, approximately 4.5 kilometers in diameter.

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6 Hours of Donington

The 6 Hours of Donington is a sports car race held at Donington Park in the United Kingdom.

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6 Hours of Monza

The 6 Hours of Monza (formerly the 1,000 Kilometres of Monza and known after 1966 as the Trofeo Filippo Caracciolo) is an endurance race, mainly for sports cars, which is held at the Autodromo Nazionale di Monza in Italy.

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6 Hours of Nürburgring

The 6 Hours of Nürburgring (formerly the Nürburgring 1000 km) was an endurance race for sports cars held on the Nürburgring in Germany and organized by the ADAC since 1953.

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6 Hours of Spa-Francorchamps

The 6 Hours of Spa-Francorchamps (formerly the 1000 Kilometres of Spa-Francorchamps) is an endurance race for sports cars held at Circuit de Spa-Francorchamps in Belgium.

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65 nm process

The 65 nm process is an advanced lithographic node used in volume CMOS (MOSFET) semiconductor fabrication.

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90 nm process

The 90 nm process refers to the technology used in semiconductor manufacturing to create integrated circuits with a minimum feature size of 90 nanometers.

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99942 Apophis

99942 Apophis (provisional designation) is a near-Earth asteroid and a potentially hazardous object with a diameter of that caused a brief period of concern in December 2004 when initial observations indicated a probability up to 2.7% that it would hit Earth on April 13, 2029.

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See also

Length

• Arc length
• Atomic radius
• Barbier's theorem
• Biblical mile
• Bond length
• Characteristic length
• Charge radius
• Classical electron radius
• Cloud drop effective radius
• Debye length
• Diameter
• Displacement (geometry)
• Dot pitch
• Effective range
• Equivalent spherical diameter
• Euclidean distance
• Feret diameter
• Focal length
• Galaxy effective radius
• Height
• Hydraulic diameter
• Hyperfocal distance
• Kilometre per square kilometre
• Length
• Length contraction
• Linear density
• List of examples of lengths
• Mean line segment length
• Mean radius
• Moment (physics)
• Orders of magnitude (length)
• Perimeter
• Radius
• Sauter mean diameter
• Spatial scale
• Staircase paradox
• Stokes radius
• String girdling Earth
• True length
• Units of length
• Vertical extent
• Wavelength
• Wetted perimeter
• Wingspan
• Work (physics)

Lists by length

• List of European cities by elevation
• List of U.S. states and territories by coastline
• List of countries and territories by number of land borders
• List of countries by length of coastline
• List of highest communities in the United States
• List of lakes by depth
• List of long tunnels by type
• List of longest arch bridge spans
• List of longest beaches
• List of longest bridges
• List of longest bridges above water in India
• List of longest buildings
• List of longest cable-stayed bridge spans
• List of longest cantilever bridge spans
• List of longest continuous truss bridge spans
• List of longest natural arches
• List of longest railway tunnels
• List of longest road tunnels
• List of longest runways
• List of longest subway tunnel sections
• List of longest suspension bridge spans
• List of longest tunnels
• List of longest walks
• List of motor yachts by length
• List of mountains by elevation
• List of pathogens by size
• List of rail tunnels in India by length
• List of river systems by length
• List of rivers of New Zealand by length
• List of tallest people
• List of waterfalls by height
• Longest flights
• Orders of magnitude (length)

Orders of magnitude

• Computer performance by orders of magnitude
• Cosmic View
• Leading-order term
• Macroscopic scale
• Microscopic scale
• Names of small numbers
• Order of magnitude
• Orders of magnitude (acceleration)
• Orders of magnitude (angular momentum)
• Orders of magnitude (area)
• Orders of magnitude (bit rate)
• Orders of magnitude (charge)
• Orders of magnitude (current)
• Orders of magnitude (data)
• Orders of magnitude (energy)
• Orders of magnitude (entropy)
• Orders of magnitude (force)
• Orders of magnitude (frequency)
• Orders of magnitude (illuminance)
• Orders of magnitude (length)
• Orders of magnitude (magnetic field)
• Orders of magnitude (magnetic moment)
• Orders of magnitude (mass)
• Orders of magnitude (molar concentration)
• Orders of magnitude (numbers)
• Orders of magnitude (power)
• Orders of magnitude (pressure)
• Orders of magnitude (probability)
• Orders of magnitude (radiation)
• Orders of magnitude (specific heat capacity)
• Orders of magnitude (speed)
• Orders of magnitude (temperature)
• Orders of magnitude (time)
• Orders of magnitude (torque)
• Orders of magnitude (voltage)
• Orders of magnitude (volume)
• Power of 10
• Powers of Ten (film)

References

[1] https://en.wikipedia.org/wiki/Orders_of_magnitude_(length)

Also known as 1 E -1 m, 1 E -10 m, 1 E -11 m, 1 E -12 m, 1 E -13 m, 1 E -14 m, 1 E -15 m, 1 E -16 m, 1 E -17 m, 1 E -18 m, 1 E -19 m, 1 E -2 m, 1 E -20 m, 1 E -21 m, 1 E -22 m, 1 E -23 m, 1 E -24 m, 1 E -3 m, 1 E -35 m, 1 E -4 m, 1 E -5 m, 1 E -6 m, 1 E -7 m, 1 E -8 m, 1 E -9 m, 1 E 0 m, 1 E 1 m, 1 E 10 m, 1 E 11 m, 1 E 12 m, 1 E 13 m, 1 E 14 m, 1 E 15 m, 1 E 16 m, 1 E 17 m, 1 E 18 m, 1 E 19 m, 1 E 2 m, 1 E 20 m, 1 E 21 m, 1 E 22 m, 1 E 23 m, 1 E 24 m, 1 E 25 m, 1 E 26 m, 1 E 3 m, 1 E 4 m, 1 E 5 m, 1 E 6 m, 1 E 7 m, 1 E 8 m, 1 E 9 m, 1 E+0 m, 1 E+1 m, 1 E+10 m, 1 E+11 m, 1 E+12 m, 1 E+13 m, 1 E+14 m, 1 E+15 m, 1 E+16 m, 1 E+17 m, 1 E+18 m, 1 E+19 m, 1 E+2 m, 1 E+20 m, 1 E+21 m, 1 E+22 m, 1 E+23 m, 1 E+24 m, 1 E+25 m, 1 E+26 m, 1 E+3 m, 1 E+4 m, 1 E+5 m, 1 E+6 m, 1 E+7 m, 1 E+8 m, 1 E+9 m, 1 E-1 m, 1 E-10 m, 1 E-11 m, 1 E-12 m, 1 E-13 m, 1 E-14 m, 1 E-15 m, 1 E-16 m, 1 E-17 m, 1 E-18 m, 1 E-19 m, 1 E-2 m, 1 E-20 m, 1 E-21 m, 1 E-22 m, 1 E-24 m, 1 E-3 m, 1 E-35 m, 1 E-4 m, 1 E-5 m, 1 E-6 m, 1 E-7 m, 1 E-8 m, 1 E-9 m, 1 E0 m, 1 E1 m, 1 E10 m, 1 E11 m, 1 E12 m, 1 E13 m, 1 E14 m, 1 E15 m, 1 E16 m, 1 E17 m, 1 E18 m, 1 E19 m, 1 E2 m, 1 E20 m, 1 E21 m, 1 E22 m, 1 E23 m, 1 E24 m, 1 E25 m, 1 E26 m, 1 E3 m, 1 E4 m, 1 E5 m, 1 E6 m, 1 E7 m, 1 E8 m, 1 E9 m, 1 Em, 1 Gm, 1 Mm, 1 Pm, 1 Tm, 1 Ym, 1 Zm, 1 attometer, 1 attometre, 1 centimeter, 1 centimetre, 1 cm, 1 dam, 1 decameter, 1 decametre, 1 decimeter, 1 decimetre, 1 dekameter, 1 dekametre, 1 dkm, 1 dm, 1 exameter, 1 exametre, 1 femtometer, 1 femtometre, 1 fm, 1 gigameter, 1 gigametre, 1 hectometer, 1 hectometre, 1 hm, 1 kilometer, 1 kilometre, 1 km, 1 m, 1 mam, 1 megameter, 1 megametre, 1 meter, 1 metre, 1 micrometer, 1 micrometre, 1 millimeter, 1 millimetre, 1 mom, 1 mym, 1 myriameter, 1 myriametre, 1 myriometer, 1 myriometre, 1 nanometer, 1 nanometre, 1 nm, 1 petameter, 1 petametre, 1 picometer, 1 picometre, 1 terameter, 1 terametre, 1 yoctometer, 1 yoctometre, 1 yottameter, 1 yottametre, 1 zeptometer, 1 zeptometre, 1 zettameter, 1 zettametre, 10 Em, 10 Gm, 10 Mm, 10 Pm, 10 Tm, 10 Ym, 10 Zm, 10 am, 10 attometers, 10 attometres, 10 centimeters, 10 centimetres, 10 cm, 10 exameters, 10 exametres, 10 femtometers, 10 femtometres, 10 fm, 10 gigameters, 10 gigametres, 10 m, 10 megameters, 10 megametres, 10 metres, 10 micrometers, 10 micrometres, 10 millimeters, 10 millimetres, 10 myriameters, 10 myriametres, 10 nanometers, 10 nanometres, 10 petameters, 10 petametres, 10 picometers, 10 picometres, 10 terameters, 10 terametres, 10 yoctometers, 10 yoctometres, 10 yottameters, 10 yottametres, 10 zeptometers, 10 zeptometres, 10 zettameters, 10 zettametres, 100 Em, 100 Gm, 100 Mm, 100 Pm, 100 Tm, 100 Ym, 100 Zm, 100 am, 100 attometers, 100 attometres, 100 centimeters, 100 centimetres, 100 cm, 100 exameters, 100 exametres, 100 femtometers, 100 femtometres, 100 fm, 100 gigameters, 100 gigametres, 100 kilometers, 100 kilometres, 100 km, 100 megameters, 100 megametres, 100 micrometers, 100 micrometres, 100 millimeters, 100 millimetres, 100 nanometers, 100 nanometres, 100 nm, 100 petameters, 100 petametres, 100 picometers, 100 picometres, 100 terameters, 100 terametres, 100 um, 100 yoctometers, 100 yoctometres, 100 yottameters, 100 yottametres, 100 zeptometers, 100 zeptometres, 100 zettameters, 100 zettametres, 1000 km, 1000 yottametres, 10000 km, 1000km, 100Em, 100Gm, 100Mm, 100Pm, 100Tm, 100Ym, 100Zm, 100am, 100cm, 100fm, 100km, 100nm, 100um, 10Em, 10Gm, 10Mm, 10Pm, 10Tm, 10Ym, 10Zm, 10am, 10cm, 10fm, 10m, 10um, 1E-1 m, 1E-10 m, 1E-10m, 1E-11 m, 1E-11m, 1E-12 m, 1E-12m, 1E-13 m, 1E-13m, 1E-14 m, 1E-14m, 1E-15 m, 1E-15m, 1E-16 m, 1E-16m, 1E-17 m, 1E-17m, 1E-18 m, 1E-18m, 1E-19 m, 1E-19m, 1E-1m, 1E-2 m, 1E-20 m, 1E-20m, 1E-21 m, 1E-21m, 1E-22 m, 1E-22m, 1E-23 m, 1E-23m, 1E-24 m, 1E-24m, 1E-2m, 1E-3 m, 1E-3m, 1E-4 m, 1E-4m, 1E-5 m, 1E-5m, 1E-6 m, 1E-6m, 1E-7 m, 1E-7m, 1E-8 m, 1E-8m, 1E-9 m, 1E-9m, 1E0 m, 1E0m, 1E1 m, 1E10 m, 1E10m, 1E11 m, 1E11m, 1E12 m, 1E12m, 1E13 m, 1E13m, 1E14 m, 1E14m, 1E15 m, 1E15m, 1E16 m, 1E16m, 1E17 m, 1E17m, 1E18 m, 1E18m, 1E19 m, 1E19m, 1E1m, 1E2 m, 1E20 m, 1E20m, 1E21 m, 1E21m, 1E22 m, 1E22m, 1E23 m, 1E23m, 1E24 m, 1E24m, 1E25 m, 1E25m, 1E26 m, 1E26m, 1E2m, 1E3 m, 1E3m, 1E4 m, 1E4m, 1E5 m, 1E5m, 1E6 m, 1E6m, 1E7 m, 1E7m, 1E8 m, 1E8m, 1E9 m, 1E9m, 1Gm, 1Mm, 1Pm, 1Tm, 1Ym, 1Zm, 1cm, 1dam, 1dkm, 1dm, 1e-1 metres, 1e-10 metres, 1e-11 metres, 1e-12 metres, 1e-13 metres, 1e-14 metres, 1e-15 metres, 1e-16 metres, 1e-17 metres, 1e-18 metres, 1e-19 metres, 1e-2 metres, 1e-20 metres, 1e-21 metres, 1e-22 metres, 1e-23 metres, 1e-24 metres, 1e-3 metres, 1e-35 m, 1e-4 metres, 1e-5 metres, 1e-6 metres, 1e-7 metres, 1e-8 metres, 1e-9 metres, 1e0 metre, 1e0 metres, 1e1 metres, 1e10 metres, 1e11 metres, 1e12 metres, 1e13 metres, 1e14 metres, 1e15 metres, 1e16 metres, 1e17 metres, 1e18 metres, 1e19 metres, 1e2 metres, 1e20 metres, 1e21 metres, 1e22 metres, 1e23 metres, 1e24 metres, 1e25 metres, 1e26 metres, 1e3 metres, 1e4 metres, 1e5 metres, 1e6 metres, 1e7 metres, 1e8 metres, 1e9 metres, 1fm, 1hm, 1km, 1m, 1mam, 1mom, 1mym, 1nm, 1um, Attometer, Attometre, Distances shorter than 1 pm, E-1 m, E-10 m, E-11 m, E-12 m, E-13 m, E-14 m, E-15 m, E-16 m, E-17 m, E-18 m, E-19 m, E-2 m, E-20 m, E-21 m, E-22 m, E-23 m, E-24 m, E-3 m, E-4 m, E-5 m, E-6 m, E-7 m, E-8 m, E-9 m, E0 m, E1 m, E10 m, E11 m, E12 m, E13 m, E14 m, E15 m, E16 m, E17 m, E18 m, E19 m, E2 m, E20 m, E21 m, E22 m, E23 m, E24 m, E25 m, E26 m, E3 m, E4 m, E5 m, E6 m, E7 m, E8 m, E9 m, Exameter, Exametre, Gigameter, Gigametre, Lengths between 1 E-1 m and 1 E0 m, Lengths between 1 E-10 m and 1 E-9 m, Lengths between 1 E-11 m and 1 E-10 m, Lengths between 1 E-12 m and 1 E-11 m, Lengths between 1 E-13 m and 1 E-12 m, Lengths between 1 E-14 m and 1 E-13 m, Lengths between 1 E-15 m and 1 E-14 m, Lengths between 1 E-16 m and 1 E-15 m, Lengths between 1 E-17 m and 1 E-16 m, Lengths between 1 E-18 m and 1 E-17 m, Lengths between 1 E-19 m and 1 E-18 m, Lengths between 1 E-2 m and 1 E-1 m, Lengths between 1 E-20 m and 1 E-19 m, Lengths between 1 E-21 m and 1 E-20 m, Lengths between 1 E-22 m and 1 E-21 m, Lengths between 1 E-23 m and 1 E-22 m, Lengths between 1 E-24 m and 1 E-23 m, Lengths between 1 E-3 m and 1 E-2 m, Lengths between 1 E-4 m and 1 E-3 m, Lengths between 1 E-5 m and 1 E-4 m, Lengths between 1 E-6 m and 1 E-5 m, Lengths between 1 E-7 m and 1 E-6 m, Lengths between 1 E-8 m and 1 E-7 m, Lengths between 1 E-9 m and 1 E-8 m, Lengths between 1 E0 m and 1 E1 m, Lengths between 1 E1 m and 1 E2 m, Lengths between 1 E10 m and 1 E11 m, Lengths between 1 E11 m and 1 E12 m, Lengths between 1 E12 m and 1 E13 m, Lengths between 1 E13 m and 1 E14 m, Lengths between 1 E14 m and 1 E15 m, Lengths between 1 E15 m and 1 E16 m, Lengths between 1 E16 m and 1 E17 m, Lengths between 1 E17 m and 1 E18 m, Lengths between 1 E18 m and 1 E19 m, Lengths between 1 E19 m and 1 E20 m, Lengths between 1 E2 m and 1 E3 m, Lengths between 1 E20 m and 1 E21 m, Lengths between 1 E21 m and 1 E22 m, Lengths between 1 E22 m and 1 E23 m, Lengths between 1 E23 m and 1 E24 m, Lengths between 1 E24 m and 1 E25 m, Lengths between 1 E25 m and 1 E26 m, Lengths between 1 E26 m and 1 E27 m, Lengths between 1 E3 m and 1 E4 m, Lengths between 1 E4 m and 1 E5 m, Lengths between 1 E5 m and 1 E6 m, Lengths between 1 E6 m and 1 E7 m, Lengths between 1 E7 m and 1 E8 m, Lengths between 1 E8 m and 1 E9 m, Lengths between 1 E9 m and 1 E10 m, Lengths greater than 1 E26 m, Lengths less than 1 E-23 m, Megameter, Megametre, Myriameter, Myriamètre, Myriometer, Myriomètre, One attometer, One attometre, One billion meters, One billion metres, One billionth meter, One billionth metre, One centimeter, One centimetre, One decameter, One decametre, One decimeter, One decimetre, One dekameter, One dekametre, One exameter, One exametre, One femtometer, One femtometre, One gigameter, One gigametre, One hectometer, One hectometre, One hundred attometers, One hundred attometres, One hundred centimeters, One hundred centimetres, One hundred exameters, One hundred exametres, One hundred femtometers, One hundred femtometres, One hundred gigameters, One hundred gigametres, One hundred kilometers, One hundred kilometres, One hundred megameters, One hundred megametres, One hundred micrometers, One hundred micrometres, One hundred millimeters, One hundred millimetres, One hundred nanometers, One hundred nanometres, One hundred petameters, One hundred petametres, One hundred picometers, One hundred picometres, One hundred terameters, One hundred terametres, One hundred yoctometers, One hundred yoctometres, One hundred yottameters, One hundred yottametres, One hundred zeptometers, One hundred zeptometres, One hundred zettameters, One hundred zettametres, One hundredth meter, One hundredth metre, One kilometer, One kilometre, One megameter, One megametre, One meter, One metre, One micrometer, One micrometre, One millimeter, One millimetre, One million meters, One million metres, One millionth meter, One millionth metre, One myriameter, One myriametre, One myriometer, One myriometre, One nanometer, One nanometre, One petameter, One petametre, One picometer, One picometre, One quadrillion meters, One quadrillion metres, One quadrillionth meter, One quadrillionth metre, One quintillion meters, One quintillion metres, One quintillionth meter, One quintillionth metre, One septillion meters, One septillion metres, One septillionth meter, One septillionth metre, One sextillion meters, One sextillion metres, One sextillionth meter, One sextillionth metre, One ten-thousandth meter, One ten-thousandth metre, One terameter, One terametre, One thousand meters, One thousand metres, One thousandth meter, One thousandth metre, One trillion meters, One trillion metres, One trillionth meter, One trillionth metre, One yoctometer, One yoctometre, One yottameter, One yottametre, One zeptometer, One zeptometre, One zettameter, One zettametre, Order of magnitude - length, Orders of magnitude (distance), Petameter, Petametre, Petametres, Quectometer, Quectometre, Relative orders of magnitude (length), Rontometer, Rontometre, Ten attometers, Ten attometres, Ten centimeters, Ten centimetres, Ten exameters, Ten exametres, Ten femtometers, Ten femtometres, Ten gigameters, Ten gigametres, Ten megameters, Ten megametres, Ten meters, Ten metres, Ten micrometers, Ten micrometres, Ten millimeters, Ten millimetres, Ten nanometers, Ten nanometres, Ten petameters, Ten petametres, Ten picometers, Ten picometres, Ten terameters, Ten terametres, Ten thousand meters, Ten thousand metres, Ten yoctometers, Ten yoctometres, Ten yottameters, Ten yottametres, Ten zeptometers, Ten zeptometres, Ten zettameters, Ten zettametres, Terameter, Terametre, Yoctometer, Yoctometre, Zeptometer, Zeptometre, Zettameter, Zettametre.

, Barnard 68, Base pair, Baseball (ball), Bathurst 1000, Bayeux Tapestry, Beach ball, Beijing, Bellatrix, Bering Strait, Berlin, Beta Canum Venaticorum, Betelgeuse, Big Ben, Black hole, Blue, Blue whale, Boötes Void, Boeing 747-400, Boeing 747-8, Bohr radius, Bok globule, Bokaro Steel City, Boomerang Nebula, Bordeaux–Paris, Brane, Brunei, Buckminsterfullerene, Bureau des Longitudes, Burj Khalifa, Caesium, California, Callirrhoe (moon), Callisto (moon), Canada, Canis Major Overdensity, Canopus, Capella, Car, Carbon, Carbon nanotube, Carbon-dioxide laser, Caribbean Sea, Casablanca, Cassette tape, Cat, Cat's Eye Nebula, Cayman Trough, Cell (biology), Cell nucleus, Cell wall, Centaurus A, Centaurus Cluster, Centimetre, Central Park, Ceres (dwarf planet), Cervix, CfA2 Great Wall, Challenger Deep, Channel Tunnel, Charon (moon), Chicago, Chile, China, Chloroplast, Christ the Redeemer (statue), Chrysler Building, Circle, Classical electron radius, Cloud, Clyde Cowan, CMB cold spot, CN Tower, CNBC, Coesite, Cologne Cathedral, Color, Colossal squid, Coma Cluster, Comet, Comet Hale–Bopp, Comet Hyakutake, Common sunflower, Comoving and proper distances, Compact disc, Compton wavelength, Concorde, Cook Strait, Cornea, Cosmic inflation, Cosmic microwave background, Cosmic string, Cotton, Covalent bond, Covalent radius, Credit card, Cross section (physics), CT Chamaeleontis, Cube, Cubic metre, Cyan, Cygnus (constellation), Dam, Danube, Debris disk, Decametre, Decimetre, Deimos (moon), Demodex, Denali, Deneb, Diameter, Diamond, Diatomic carbon, Dingo Fence, Disk read-and-write head, Distance, Distance measure, DNA, Dogger Bank, Douro, Drosophila bifurca, Dual in-line package, Dubai, Dublin, Dust, Dwarf galaxy, Dwarf planet, Earth, Earth radius, Earth's orbit, Egg cell, Eiffel Tower, El Paso, Texas, Electron, Electron microscope, Electronvolt, Elephant, Ellipsoid, Elliptical galaxy, Empire State Building, Engineering tolerance, English Channel, Epsilon Pegasi, Equator, Equatorial bulge, Eridanus Cluster, Eris (dwarf planet), Escherichia coli, Eta and eta prime mesons, Eta Carinae, Euglena gracilis, Europa (moon), Europe, Event horizon, Everything2, Exoplanet, Exosphere, Extreme ultraviolet lithography, Fédération Aéronautique Internationale, Femtometre, Fencing, Fermi problem, Finger, Fjord, Flagellum, Flea, Flying height, Fog, Foot (unit), Football pitch, Fornax Cluster, Fort Kent, Maine, France, Frederick Reines, Galactic plane, Galactic year, Galaxy, Galaxy cluster, Galaxy filament, Galilean moons, Gamma ray, Gamma-ray burst, Ganymede (moon), Gateway Arch, Geography of Australia, Geography of Finland, Geography of Norway, Geography of Sweden, Geometric mean, Geostationary orbit, Germany, Giant Gippsland earthworm, Giant squid, Giraffe, Giridih, Gliese 581d, Globular cluster, Glucose, Gluon, Gobi Desert, Golden Gate Bridge, Golf ball, Goliath birdeater, Goliath frog, Googol, Googolplex, GQ Lupi b, Gram stain, Gram-positive bacteria, Grand Canyon, Grand Union Canal, Graphene, Gravitational field, Gravitational singularity, Gravitational wave, GRB 980425, GRB 990123, Great Barrier Reef, Great Pyramid of Giza, Great Red Spot, Great Wall of China, Green, Guinness World Records, Hair, Hair follicle, Halley's Comet, Hand (unit), Hard disk drive, Hartle–Hawking state, Haumea, Hawaii, HD 100546, HD 149026 b, Hectare, Hectometre, Heliosphere, Helium, Helix, Helix Nebula, Hemoglobin, HEPA, Hertz, High Force, High Speed 1, High-resolution transmission electron microscopy, Hill sphere, HIP 56948, Hipparcos, HIV, HIV/AIDS, Homo floresiensis, Hong Kong, Horologium-Reticulum Supercluster, Houlton, Maine, House dust mite, Hubble Deep Field, Hubble Space Telescope, Human, Hume Highway, Hydrogen, Hydrogen atom, Hydrogen line, Hyperfine structure, Hypergiant, Hyperion (tree), HyperPhysics, Iapetus (moon), IC 10, IC 1101, IC 342/Maffei Group, Ice, Inch, India, Indianapolis 500, Indigo, Infrared, Intel 4004, International Astronomical Union, International Space Station, International System of Units, Interstate 90, Interstate 95, Io (moon), Iran, ISM radio band, ISO/IEC 7810, Italy, James Webb Space Telescope, Japan, Japanese spider crab, Jules Verne, Jupiter, K2, Kalahari Desert, Kansas State University, Kármán line, Key West, Kilometre, Kingda Ka, Kuiper belt, KVLY-TV mast, Kyiv, Lake, Lake Baikal, Lake Geneva, Lake Pontchartrain Causeway, Land's End to John o' Groats, Langley Research Center, Large Hadron Collider, Large Magellanic Cloud, Laser Interferometer Space Antenna, Latitude, League (unit), Leaning Tower of Pisa, Leatherback sea turtle, Leda (moon), Leedsichthys, Lego, Length, Leo I (dwarf galaxy), Lexell's Comet, Li (unit), Light, Light-second, Light-year, LIGO, Lineus longissimus, Lion's mane jellyfish, List of humorous units of measurement, List of largest stars, List of longest runways, List of the most distant astronomical objects, Lithium fluoride, Litre, Liver, Local Group, London, London Underground, Longwave, Loop quantum gravity, Los Angeles, Louisiana, Low Earth orbit, Lunar distance, Luxor Obelisks, Lyman-alpha, Lysosome, LZ 129 Hindenburg, Macrophage, Madrid Metro, Maffei 1, Major League Baseball, Malin 1, Manhattan, Marathon, Mariana Trench, Mars, Marylebone Cricket Club, Matter wave, Matterhorn, Mauna Kea, Mediterranean Sea, Melbourne, MEMS, Mercury (planet), Meridian (geography), Meridian arc, Meson, Mesoporous silica, Messier 13, Messier 4, Meteoroid, Metre, Metric prefix, Metric system, Miami, Michigan State University, Microchaetus rappi, Microfilament, Micrometre, Microprocessor, Microsecond, Microtubule, Mid-ocean ridge, Mil Mi-26, Mile, Milky Way, Millau Viaduct, Millimetre, Millisecond, Mini, Minor-planet moon, Minute and second of arc, Mira, Mira variable, Miranda (moon), Mississippi River, Missouri River, Mont Blanc, Moon, Moons of Jupiter, Mosquito, Mount Damavand, Mount Elbrus, Mount Everest, Mount Fuji, Mount Kilimanjaro, Mount Kosciuszko, Mount Logan, Mount Wilhelm, Mountain range, Mu Cephei, Mumbai, Munda Biddi Trail, Mute swan, Mycoplasma, Myria-, Naiad (moon), Naked eye, Namib, Nanobe, Nanometre, Nanosecond, Nanowire, NASA, Nashik, National Highways Development Project, National highways of India, National Institute of Standards and Technology, Natural satellite, Nautical mile, Nepal, Neptune, Nereid (moon), Neso (moon), Neutron, Neutron star, New York City, NGC 2419, NGC 4889, NGC 604, NGC 6946, Niagara Falls, Nile, Norden, Lower Saxony, North America, North Pole, North Sea, Norway, Nuclear physics, Nucleon, Observable universe, Oceania, OGLE-2005-BLG-390Lb, OGLE-TR-122, OGLE-TR-56, Okapi, Okinawa Prefecture, Olympus Mons, Om (river), Omega Centauri, Oort cloud, Orange (colour), Orbit, Order of magnitude, Orders of magnitude (area), Orders of magnitude (length), Orders of magnitude (temperature), Orders of magnitude (volume), Orion Nebula, Outer space, Paedocypris progenetica, Paint, Pale Blue Dot, Palm Jebel Ali, Pan (moon), Panama Canal, Panzer VIII Maus, Papua New Guinea, Paraceratherium, Paramecium, Parasang, Paris, Paris Métro, Paris–Brest–Paris, Parsec, Particle accelerator, Particle horizon, Particle physics, Peel P50, Pegasus (constellation), Pelagornis, Perseus Arm, Phobos (moon), Phoebe (moon), Phospholipid, Physical cosmology, Physics, Pi, Piano, Picometre, Picosecond, Pine, Pinus lambertiana, Pinwheel Galaxy, Pion, Pioneer 10, Pioneer 11, Pisces–Cetus Supercluster Complex, Pistol Star, Pixel, Planck (spacecraft), Planet, Pluto, Pollux (star), Popular Mechanics, Porcine circovirus, Preon, Protein, Proteus (moon), Proton, Proxima Centauri, Prudhoe Bay, Alaska, PSR B1257+12, PSR B1620−26 b, PSR B1919+21, Pune, Pyramid of Djoser, Pyrenees, Qatar, Quantum foam, Quaoar, Quark, Quartz, Quasar, Quasi-star, Queen Alexandra's birdwing, Quetzalcoatlus, Quintal, Rabies, Rafflesia arnoldii, Rail transport, Rapier, Red, Red blood cell, Red clump, Red dwarf, Red giant, Red Sea, Red supergiant, Red-giant branch, Redshift, Regulus, Rensselaer Polytechnic Institute, Rho Cassiopeiae, Rhode Island, Rigel, Road train, Robert Wadlow, Rome, Russia, Ruthenium, Rwanda, Sagittarius A*, Sagittarius Dwarf Spheroidal Galaxy, Saguaro, Sahara, Salt, San Diego, San Francisco, Sand, Satellite galaxy, Saturn, Saturn V, Sauroposeidon, Scandinavian mile, Schwarzschild radius, Scientific American, Scud missile, Sculptor Galaxy, Sculptor Group, SEA-ME-WE 3, Seawise Giant, Second, Sedna (dwarf planet), Seikan Tunnel, Semiconductor device fabrication, Shape of the universe, Shapley Supercluster, SI base unit, Sicily, Silk, Silt, Silver, Singapore, Sirius, Skin, Sky Tower (Auckland), Sloan Great Wall, Small Magellanic Cloud, Smoke, SN 1987A, Snowy albatross, Sodium chloride, Sognefjord, Solar analog, Solar cell, Solar mass, Solar System, Sombrero Galaxy, South America, Space, Spaceflight, Spain, Spatial scale, Speed of light, Speed of sound, Sperm, Sperm whale, Spermatozoon, Sphere, Spider silk, Spiral arm, Split Point Lighthouse, Square, Square kilometre, St. John's, Newfoundland and Labrador, Star, Starr Bumble Bee II, Statue of Liberty, Statue of Unity, Stephan's Quintet, Stere, Stingray Nebula, Stockholm, Strait of Dover, Strait of Gibraltar, Strait of Messina, Stratosphere, String (physics), String theory, Strong interaction, Sucrose, Suez Canal, Sugar, Sulfur, Sun, Sun-synchronous orbit, Supercluster, Supermassive black hole, Supernova, Supersaurus, Surgical mask, Suspension bridge, Suzuka 1000 km, Sweden, Sydney, Széchenyi Chain Bridge, T7 phage, Taj Mahal, Tanggula Mountains, Tanggula Pass, Tau Ceti, Technetium, Texas, The Astrophysical Journal, The New York Times Building, The Sydney Morning Herald, The World (archipelago), Themisto (moon), Thiomargarita namibiensis, Thousandth of an inch, Three Gorges Dam, Thulium, Titan (moon), Titanic, Tobacco mosaic virus, Tonne, Trans-Canada Highway, Trans-Neptunian object, Trans-Siberian Railway, Transistor, TrES-4b, Triton (moon), Troposphere, Tsuga heterophylla, Tugela Falls, Turkey, Turn (biochemistry), Twenty Thousand Leagues Under the Seas, Twip, U.S. Route 1, Uganda, Ulm Minster, Ultra high frequency, Ultra-low particulate air, Ultraviolet, Ulysses (spacecraft), Unit cell, Unit of measurement, United States, United States Department of Commerce, Universe, University of California, Berkeley, University of California, San Diego, University of Nebraska–Lincoln, University of Wisconsin Press, Uranium, Uranus, Vacuum, Valles Marineris, Van der Waals radius, Vega, Vela Pulsar, Venezuela, Venus, Victoria, British Columbia, Vinson Massif, Violet (color), Violin, Virgo Cluster, Virgo Supercluster, Virus, Visible spectrum, Vladivostok, Volga, Volvo P1800, Voyager 1, Voyager 2, VV Cephei, VY Canis Majoris, Warsaw radio mast, Washington Monument, Washington, D.C., WASP-12b, Water, Wavelength, Weak interaction, West Virginia, Western Australia, Whale shark, White blood cell, White dwarf, White-nosed coati, Wilkinson Microwave Anisotropy Probe, Wool, World Athletics, World map, World's littlest skyscraper, X-ray, Xinhua News Agency, Yangtze, Yard, Yeast, Yellow, Yellow hypergiant, Yellow River, Zirconium, 10 nm process, 1000 km Brands Hatch, 1000 km Buenos Aires, 1000 km Zeltweg, 14 nm process, 1620 Geographos, 1931 Dogger Bank earthquake, 2008 HJ, 2008 TC3, 22 nm process, 24 Hours of Le Mans, 243 Ida, 25143 Itokawa, 2dF Galaxy Redshift Survey, 3-sphere, 32 nm process, 3753 Cruithne, 3C 273, 4 Hours of Silverstone, 4 Vesta, 5.56×45mm NATO, 51 Pegasi, 5535 Annefrank, 6 Hours of Donington, 6 Hours of Monza, 6 Hours of Nürburgring, 6 Hours of Spa-Francorchamps, 65 nm process, 90 nm process, 99942 Apophis.

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