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Aconcagua is the highest mountain outside Asia, at, and the highest point in the Southern Hemisphere.
Acrylic fibers are synthetic fibers made from a polymer (polyacrylonitrile) with an average molecular weight of ~100,000, about 1900 monomer units.
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.
Africa is the world's second largest and second most-populous continent (behind Asia in both categories).
Agence France-Presse (AFP) is an international news agency headquartered in Paris, France.
Aireys Inlet is a small coastal inlet and town located on the Great Ocean Road, southwest of Melbourne, Victoria, Australia.
The is a suspension bridge, which links the city of Kobe on the Japanese mainland of Honshu to Iwaya on Awaji Island.
tag specifies a name parameter.
Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).
The albumins (formed from Latin: albumen "(egg) white; dried egg white") are a family of globular proteins, the most common of which are the serum albumins.
Aldebaran, designated Alpha Tauri (α Tauri, abbreviated Alpha Tau, α Tau), is an orange giant star located about 65 light-years from the Sun in the zodiac constellation of Taurus.
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.
Alpha Centauri (α Centauri, abbreviated Alf Cen or α Cen) is the star system closest to the Solar System, being from the Sun.
The alpha helix (α-helix) is a common motif in the secondary structure of proteins and is a righthand-spiral conformation (i.e. helix) in which every backbone N−H group donates a hydrogen bond to the backbone C.
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus.
The Alps (Alpes; Alpen; Alpi; Alps; Alpe) are the highest and most extensive mountain range system that lies entirely in Europe,The Caucasus Mountains are higher, and the Urals longer, but both lie partly in Asia.
Amalthea (Ἀμάλθεια) is the third moon of Jupiter in order of distance from the planet.
The Amazon River (or; Spanish and Amazonas) in South America is the largest river by discharge volume of water in the world, and either the longest or second longest.
American football, referred to as football in the United States and Canada and also known as gridiron, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end.
American Scientist (informally abbreviated AmSci) is an American bimonthly science and technology magazine published since 1913 by Sigma Xi, The Scientific Research Society.
Amoeba proteus, alternatively Chaos diffluens, is an amoeba closely related to the giant amoebae and a species commonly bought at science supply stores.
The Andamanese are the various indigenous peoples of the Andaman Islands, part of India's Andaman and Nicobar Islands union territory in the southeastern part of the Bay of Bengal.
The Andromeda Galaxy, also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth, and the nearest major galaxy to the Milky Way.
Angel Falls (Salto Ángel; Pemon language: Kerepakupai Meru meaning "waterfall of the deepest place", or Parakupá Vená, meaning "the fall from the highest point") is a waterfall in Venezuela.
Antarctica is Earth's southernmost continent.
Antares, also designated Alpha Scorpii (α Scorpii, abbreviated Alpha Sco, α Sco), is on average the fifteenth-brightest star in the night sky, and the brightest star in the constellation of Scorpius.
Anthrax is an infection caused by the bacterium Bacillus anthracis.
The Antonov An-124 Ruslan (Антонов Ан-124 "Руслан") (NATO reporting name: Condor) is a strategic airlift jet aircraft.
The Antonov An-225 Mriya (Антонов Ан-225, lit, NATO reporting name: "Cossack") is a strategic airlift cargo aircraft that was designed by the Antonov Design Bureau in the Ukrainian SSR within the Soviet Union during the 1980s.
An apple is a sweet, edible fruit produced by an apple tree (Malus pumila).
An apsis (ἁψίς; plural apsides, Greek: ἁψῖδες) is an extreme point in the orbit of an object.
Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces.
Argentavis magnificens ("magnificent Argentine bird", or more literally "magnificent silver bird") was among the largest flying birds ever to exist, quite possibly surpassed in wingspan only by the recently discovered Pelagornis sandersi.
An artificial island or man-made island is an island that has been constructed by people rather than formed by natural means.
As the crow flies, similar to in a beeline, is an idiom for the most direct path between two points.
Association football, more commonly known as football or soccer, is a team sport played between two teams of eleven players with a spherical ball.
Asteroids are minor planets, especially those of the inner Solar System.
The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
Astronomy & Astrophysics is a peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics.
The Atlantic Ocean is the second largest of the world's oceans with a total area of about.
The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.
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.
Auckland is a city in New Zealand's North Island.
Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands.
Australian Associated Press (AAP) is an Australian news agency.
In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.
The ångström or angstrom is a unit of length equal to (one ten-billionth of a metre) or 0.1 nanometre.
École Polytechnique (also known as EP or X) is a French public institution of higher education and research in Palaiseau, a suburb southwest of Paris.
Bacteria (common noun bacteria, singular bacterium) is a type of biological cell.
Bad Astronomy: Misconceptions and Misuses Revealed, from Astrology to the Moon Landing "Hoax" is a non-fiction book by the American astronomer Phil Plait, also known as "the Bad Astronomer".
A football, soccer ball, or association football ball is the ball used in the sport of association football.
A balloon is a flexible bag that can be inflated with a gas, such as helium, hydrogen, nitrous oxide, oxygen, air or water.
A banana is an edible fruit – botanically a berry – produced by several kinds of large herbaceous flowering plants in the genus Musa.
Barnard 68 is a molecular cloud, dark absorption nebula or Bok globule, towards the southern constellation Ophiuchus and well within our own galaxy at a distance of about 400 light-years, so close that not a single star can be seen between it and the Sun.
A base pair (bp) is a unit consisting of two nucleobases bound to each other by hydrogen bonds.
Baseball is a bat-and-ball game played between two opposing teams who take turns batting and fielding.
Basketball is a team sport played on a rectangular court.
In basketball, the basketball court is the playing surface, consisting of a rectangular floor with baskets at either end.
The Bathurst 1000 (currently branded as the Supercheap Auto Bathurst 1000 for sponsorship reasons) is a touring car race held annually on the Mount Panorama Circuit in Bathurst, New South Wales, Australia.
The Bayeux Tapestry (Tapisserie de Bayeux or La telle du conquest; Tapete Baiocense) is an embroidered cloth nearly long and tall, which depicts the events leading up to the Norman conquest of England concerning William, Duke of Normandy, and Harold, Earl of Wessex, later King of England, and culminating in the Battle of Hastings.
A beach ball is an inflatable ball for beach and water games.
Bees are flying insects closely related to wasps and ants, known for their role in pollination and, in the case of the best-known bee species, the European honey bee, for producing honey and beeswax.
New!!: Orders of magnitude (length) and Bee ·
Beijing, formerly romanized as Peking, is the capital of the People's Republic of China, the world's second most populous city proper, and most populous capital city.
Bellatrix, also designated Gamma Orionis (γ Orionis, abbreviated Gamma Ori, γ Ori), is the third-brightest star in the constellation of Orion, 5° west of the red giant Alpha Orionis (Betelgeuse).
The Bering Strait (Берингов пролив, Beringov proliv, Yupik: Imakpik) is a strait of the Pacific, which borders with the Arctic to north.
Berlin is the capital and the largest city of Germany, as well as one of its 16 constituent states.
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.
Betelgeuse, also designated Alpha Orionis (α Orionis, abbreviated Alpha Ori, α Ori), is the ninth-brightest star in the night sky and second-brightest in the constellation of Orion.
The Bic Cristal (stylised as BIC Cristal and also known as the Bic pen) is an inexpensive disposable ballpoint pen mass-produced and sold by Société Bic of Clichy, Hauts-de-Seine, France.
Big Ben is the nickname for the Great Bell of the clock at the north end of the Palace of Westminster in London and is usually extended to refer to both the clock and the clock tower.
Birds, also known as Aves, are a group of endothermic vertebrates, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.
A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it.
Blue is one of the three primary colours of pigments in painting and traditional colour theory, as well as in the RGB colour model.
Blue supergiant stars are hot luminous stars, referred to scientifically as OB supergiants.
The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whale parvorder, Mysticeti.
The Boeing 747-400 is an American wide-body jet airliner developed by Boeing Commercial Airplanes.
The Boeing 747-8 is a wide-body jet airliner developed by Boeing Commercial Airplanes.
The Bohr radius (a0 or rBohr) 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.
In astronomy, Bok globules are isolated and relatively small dark nebulae, containing dense cosmic dust and gas from which star formation may take place.
Bokaro Steel City is a city located in East India in the state of Jharkhand.
The Boomerang Nebula is a protoplanetary nebula located 5,000 light-years away from Earth in the constellation Centaurus.
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.
The bottom quark or b quark, also known as the beauty quark, is a third-generation quark with a charge of − ''e''.
In string theory and related theories such as supergravity theories, a brane is a physical object that generalizes the notion of a point particle to higher dimensions.
Buckminsterfullerene is a type of fullerene with the formula C60.
Buda was the ancient capital of the Kingdom of Hungary and since 1873 has been the western part of the Hungarian capital Budapest, on the west bank of the Danube.
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.
The Burj Khalifa (برج خليفة, Arabic for "Khalifa Tower"; pronounced), known as the Burj Dubai before its inauguration in 2010, is a skyscraper in Dubai, United Arab Emirates.
Butterflies are insects in the macrolepidopteran clade Rhopalocera from the order Lepidoptera, which also includes moths.
Caesium (British spelling and IUPAC spelling) or cesium (American spelling) is a chemical element with symbol Cs and atomic number 55.
Callirrhoe (Greek: Καλλιρρόη), also known as (17), is one of Jupiter's outermost named natural satellites.
Callisto (Jupiter IV) is the second-largest moon of Jupiter, after Ganymede.
Canada is a country located in the northern part of North America.
Canadian football is a sport played in Canada in which two teams of 12 players each compete for territorial control of a field of play long and wide attempting to advance a pointed prolate spheroid ball into the opposing team's scoring area (end zone).
The Canis Major Dwarf Galaxy (CMa Dwarf) or Canis Major Overdensity (CMa Overdensity) is a disputed dwarf irregular galaxy in the Local Group, located in the same part of the sky as the constellation Canis Major.
Canopus, also designated Alpha Carinae (α Carinae, abbreviated Alpha Car, α Car), is the brightest star in the southern constellation of Carina, and the second-brightest star in the night-time sky, after Sirius.
Capella, also designated Alpha Aurigae (α Aurigae, abbreviated Alpha Aur, α Aur), is the brightest star in the constellation of Auriga, the sixth-brightest in the night sky, and the third-brightest in the northern celestial hemisphere after Arcturus and Vega.
A car (or automobile) is a wheeled motor vehicle used for transportation.
New!!: Orders of magnitude (length) and Car ·
Carbon (from carbo "coal") is a chemical element with symbol C and atomic number 6.
The carbon dioxide laser (CO2 laser) was one of the earliest gas lasers to be developed.
Carbon nanotubes (CNTs) are allotropes of carbon with a cylindrical nanostructure.
The Caribbean Sea (Mar Caribe; Mer des Caraïbes; Caraïbische Zee) is a sea of the Atlantic Ocean in the tropics of the Western Hemisphere.
Casablanca (ad-dār al-bayḍāʾ; anfa; local informal name: Kaẓa), located in the central-western part of Morocco bordering the Atlantic Ocean, is the largest city in Morocco.
The domestic cat (Felis silvestris catus or Felis catus) is a small, typically furry, carnivorous mammal.
New!!: Orders of magnitude (length) and Cat ·
The Cat's Eye Nebula or NGC 6543, is a relatively bright planetary nebula in the northern constellation of Draco, discovered by William Herschel on February 15, 1786.
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.
The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known living organisms.
The cell membrane (also known as the plasma membrane or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates the interior of all cells from the outside environment (the extracellular space).
In cell biology, the nucleus (pl. nuclei; from Latin nucleus or nuculeus, meaning kernel or seed) is a membrane-enclosed organelle found in eukaryotic cells.
A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane.
The cello (plural cellos or celli) or violoncello is a string instrument.
Centaurus A or NGC 5128 is a galaxy in the constellation of Centaurus.
The Centaurus Cluster (A3526) is a cluster of hundreds of galaxies, located approximately 170 million light years away in the Centaurus constellation.
A centimetre (international spelling as used by the International Bureau of Weights and Measures; symbol cm) or centimeter (American spelling) is a unit of length in the metric system, equal to one hundredth of a metre, centi being the SI prefix for a factor of.
Ceres (minor-planet designation: 1 Ceres) is the largest object in the asteroid belt that lies between the orbits of Mars and Jupiter, slightly closer to Mars' orbit.
The cervix or cervix uteri (neck of the uterus) is the lower part of the uterus in the human female reproductive system.
The Great Wall (also called Coma Wall), sometimes specifically referred to as the CfA2 Great Wall, is an immense galaxy filament.
The Challenger Deep is the deepest known point in the Earth's seabed hydrosphere, with a depth of by direct measurement from submersibles, and slightly more by sonar bathymetry.
The Channel Tunnel (Le tunnel sous la Manche; also nicknamed the Chunnel) is a rail tunnel linking Folkestone, Kent, in the United Kingdom, with Coquelles, Pas-de-Calais, near Calais in northern France, beneath the English Channel at the Strait of Dover.
The rms charge radius is a measure of the size of an atomic nucleus, particularly of a proton or a deuteron.
Charon, also known as (134340) Pluto I, is the largest of the five known natural satellites of the dwarf planet Pluto.
Chicago, officially the City of Chicago, is the third most populous city in the United States, after New York City and Los Angeles.
Childbirth, also known as labour and delivery, is the ending of a pregnancy by one or more babies leaving a woman's uterus by vaginal passage or C-section.
Chile, officially the Republic of Chile, is a South American country occupying a long, narrow strip of land between the Andes to the east and the Pacific Ocean to the west.
China, officially the People's Republic of China (PRC), is a unitary one-party sovereign state in East Asia and the world's most populous country, with a population of around /1e9 round 3 billion.
Chloroplasts are organelles, specialized compartments, in plant and algal cells.
The Chrysler Building is an Art Deco–style skyscraper located on the East Side of Midtown Manhattan in New York City, at the intersection of 42nd Street and Lexington Avenue in the Turtle Bay neighborhood of Manhattan.
A circle is a simple closed shape.
A circle of latitude on Earth is an abstract east–west circle connecting all locations around Earth (ignoring elevation) at a given latitude.
The classical electron radius is a combination of fundamental physical quantities that define a length scale for problems involving electrons interacting with electromagnetic radiation.
In meteorology, a cloud is an aerosol consisting of a visible mass of minute liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body.
Clyde Lorrain Cowan Jr (December 6, 1919 in Detroit, Michigan – May 24, 1974 in Bethesda, Maryland) was an American physicist, the co-discoverer of the neutrino along with Frederick Reines.
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).
The CN Tower (Tour CN) is a concrete communications and observation tower located in the downtown core of the city of Toronto, Ontario, Canada.
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.
A coffee bean is a seed of the coffee plant and the source for coffee.
Color (American English) or colour (Commonwealth English) is the characteristic of human visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple.
The colossal squid (Mesonychoteuthis hamiltoni, from Greek mesos (middle), onycho (claw, nail), and teuthis (squid)), sometimes called the Antarctic squid or giant cranch squid, is believed to be the largest squid species in terms of mass.
The Coma Cluster (Abell 1656) is a large cluster of galaxies that contains over 1,000 identified galaxies.
A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.
Comet Hale–Bopp (formally designated C/1995 O1) is a comet that was perhaps the most widely observed of the 20th century, and one of the brightest seen for many decades.
Comet Hyakutake (formally designated C/1996 B2) is a comet, discovered on 31 January 1996, that passed very close to Earth in March of that year.
In standard cosmology, comoving distance and proper distance are two closely related distance measures used by cosmologists to define distances between objects.
The Compact Audio Cassette (CAC) or Musicassette (MC), also commonly called the cassette tape or simply tape or cassette, is an analog magnetic tape recording format for audio recording and playback.
Compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony and released in 1982.
The Compton wavelength is a quantum mechanical property of a particle.
The Aérospatiale/BAC Concorde is a British-French turbojet-powered supersonic passenger airliner that was operated from 1976 until 2003.
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.
The cosmic microwave background (CMB, CMBR) is electromagnetic radiation as a remnant from an early stage of the universe in Big Bang cosmology.
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.
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.
A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms.
The covalent radius, rcov, is a measure of the size of an atom that forms part of one covalent bond.
A credit card is a payment card issued to users (cardholders) to enable the cardholder to pay a merchant for goods and services based on the cardholder's promise to the card issuer to pay them for the amounts so paid plus the other agreed charges.
Cricket is a bat-and-ball game played between two teams of eleven players each on a cricket field, at the centre of which is a rectangular pitch with a target at each end called the wicket (a set of three wooden stumps upon which two bails sit).
When two particles interact, their mutual cross section is the area transverse to their relative motion within which they must meet in order to scatter from each other.
In crystallography, crystal structure is a description of the ordered arrangement of atoms, ions or molecules in a crystalline material.
CT Chamaeleontis (CT Cha) is a T Tauri star in the constellation of Chamaeleon.
In geometry, a cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex.
The cubic metre (in British English and international spelling as used by the International Bureau of Weights and Measures) or cubic meter (in American English) is the SI derived unit of volume.
Cyan is a greenish-blue color.
A dam is a barrier that stops or restricts the flow of water or underground streams.
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The Danube or Donau (known by various names in other languages) is Europe's second longest river, after the Volga.
The Danyang–Kunshan Grand Bridge is a long viaduct on the Beijing–Shanghai High-Speed Railway.
A debris disk is a circumstellar disk of dust and debris in orbit around a star.
A decametre or dekametre (American spelling: decameter, earlier dekameter; symbol dam,, This measure is included in the SI mostly for completeness: in principle, any combination of prefix and unit can be written, but many are rarely used in practice. One practical use of the decameter is for altitude of geopotential heights in meteorology. Meteorologists also use another seldom encountered SI prefix: hecto- in hectopascal (hPa). The volumetric form (see below) cubic decametre is convenient for describing large volumes of water such as in rivers and lakes. The square decametre (dam2) also known as the are (a), is the basis for the hectare (100 dam2), the standard metric unit of land registry.
The decimetre (SI symbol dm) is a unit of length in the metric system, equal to one tenth of a metre (the International System of Units base unit of length), ten centimetres or 1/0.254 (approximately 3.93700787) inches.
Deimos (systematic designation: Mars II) is the smaller and outer of the two natural satellites of the planet Mars, the other being Phobos.
Demodex is a genus of tiny mites that live in or near hair follicles of mammals.
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.
Deneb, also designated α Cygni (Latinised alpha Cygni, abbreviated Alpha Cyg, α Cyg), is the brightest star in the constellation of Cygnus.
In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.
Diamond is a solid form of carbon with a diamond cubic crystal structure.
Diatomic carbon (systematically named ethenediylidene and dicarbon(C—C)), also called dicarbon, is an inorganic chemical with the chemical formula C.
Dice (singular die or dice; from Old French dé; from Latin datum "something which is given or played") are small throwable objects with multiple resting positions, used for generating random numbers.
The Dingo Fence or Dog Fence is a pest-exclusion fence that was built in Australia during the 1880s and finished in 1885, to keep dingoes out of the relatively fertile south-east part of the continent (where they had largely been exterminated) and protect the sheep flocks of southern Queensland.
Dinosaurs are a diverse group of reptiles of the clade Dinosauria.
Disk read/write heads are the small parts of a disk drive which move above the disk platter and transform the platter's magnetic field into electrical current (read the disk) or, vice versa, transform electrical current into magnetic field (write the disk).
Distance is a numerical measurement of how far apart objects are.
Distance measures are used in physical cosmology to give a natural notion of the distance between two objects or events in the universe.
Deoxyribonucleic acid (DNA) is a thread-like chain of nucleotides carrying the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses.
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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.
A door is a moving mechanism used to block off and allow access to, an entrance to or within an enclosed space, such as a building, room or vehicle.
A door handle is an attached object or mechanism used to manually open or close a door.
The Douro (Douro; Duero; translation) is one of the major rivers of the Iberian Peninsula, flowing from its source near Duruelo de la Sierra in Soria Province across northern-central Spain and Portugal to its outlet at Porto.
The down quark or d quark (symbol: d) is the second-lightest of all quarks, a type of elementary particle, and a major constituent of matter.
Driver location signs are signs placed every along each side of English motorways, and some other major English roads, to provide information that will allow motorists to know their precise location.
In microelectronics, a dual in-line package (DIP or DIL), or dual in-line pin package (DIPP) is an electronic component package with a rectangular housing and two parallel rows of electrical connecting pins.
Dubai (دبي) is the largest and most populous city in the United Arab Emirates (UAE).
Dublin is the capital of and largest city in Ireland.
Dust are fine particles of matter.
A dwarf galaxy is a small galaxy composed of about 100 million up to several billion stars, a small number compared to the Milky Way's 200–400 billion stars.
A dwarf planet is a planetary-mass object that is neither a planet nor a natural satellite.
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
Earth radius is the approximate distance from Earth's center to its surface, about.
Eggs are laid by female animals of many different species, including birds, reptiles, amphibians, mammals, and fish, and have been eaten by humans for thousands of years.
The egg cell, or ovum (plural ova), is the female reproductive cell (gamete) in oogamous organisms.
The Eiffel Tower (tour Eiffel) is a wrought iron lattice tower on the Champ de Mars in Paris, France.
El Paso (from Spanish, "the pass") is a city in and the seat of El Paso County, Texas, United States.
The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary charge.
An electron microscope is a microscope that uses a beam of accelerated electrons as a source of illumination.
In physics, the electronvolt (symbol eV, also written electron-volt and electron volt) is a unit of energy equal to approximately joules (symbol J).
Elephants are large mammals of the family Elephantidae and the order Proboscidea.
An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation.
An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image.
The Empire State Building is a 102-story Art Deco skyscraper in Midtown Manhattan, New York City.
The English Channel (la Manche, "The Sleeve"; Ärmelkanal, "Sleeve Channel"; Mor Breizh, "Sea of Brittany"; Mor Bretannek, "Sea of Brittany"), also called simply the Channel, is the body of water that separates southern England from northern France and links the southern part of the North Sea to the Atlantic Ocean.
An equator of a rotating spheroid (such as a planet) is its zeroth circle of latitude (parallel).
An equatorial bulge is a difference between the equatorial and polar diameters of a planet, due to the force exerted by its rotation.
The Eridanus Cluster is a galaxy cluster roughly from Earth, containing about 73 main galaxies and about 200 total galaxies.
Eris (minor-planet designation 136199 Eris) is the most massive and second-largest (by volume) dwarf planet in the known Solar System.
Escherichia coli (also known as E. coli) is a Gram-negative, facultatively anaerobic, rod-shaped, coliform bacterium of the genus Escherichia that is commonly found in the lower intestine of warm-blooded organisms (endotherms).
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 7,500 light-years (2,300 parsecs) distant in the constellation Carina.
Euglena gracilis is a species of single-celled Eukaryote algae in the genus Euglena.
Europa or as Ευρώπη (Jupiter II) is the smallest of the four Galilean moons orbiting Jupiter, and the sixth-closest to the planet.
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere.
In general relativity, an event horizon is a region in spacetime beyond which events cannot affect an outside observer.
Everything2 (styled Everything2), or E2 for short, is a collaborative Web-based community consisting of a database of interlinked user-submitted written material.
An exoplanet or extrasolar planet is a planet outside our solar system.
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 too low for them to behave as a gas by colliding with each other.
The Fédération aéronautique internationale (FAI; The World Air Sports Federation), is the world governing body for air sports.
The femtometre (American spelling femtometer, symbol fm derived from the Danish and Norwegian word femten, "fifteen"+Ancient Greek: μέτρον, metrοn, "unit of measurement") is an SI unit of length equal to 10−15 metres, which means a quadrillionth of one.
Fencing is a group of three related combat sports.
In physics or engineering education, a Fermi problem, Fermi quiz, Fermi question, Fermi estimate, or order estimation is an estimation problem designed to teach dimensional analysis or approximation, and such a problem is usually a back-of-the-envelope calculation.
The International Basketball Federation, more commonly known as FIBA, FIBA World, or FIBA International, from its French name Fédération internationale de basket-ball, is an association of national organizations which governs international competition in basketball.
The field-effect transistor (FET) is a transistor that uses an electric field to control the electrical behaviour of the device.
A film, also called a movie, motion picture, moving pícture, theatrical film, or photoplay, is a series of still images that, when shown on a screen, create the illusion of moving images.
A finger is a limb of the human body and a type of digit, an organ of manipulation and sensation found in the hands of humans and other primates.
Fire ant is the common name for several species of ants in the genus Solenopsis.
Fish are gill-bearing aquatic craniate animals that lack limbs with digits.
Geologically, a fjord or fiord is a long, narrow inlet with steep sides or cliffs, created by a glacier.
A flagellum (plural: flagella) is a lash-like appendage that protrudes from the cell body of certain bacterial and eukaryotic cells.
Fleas are small flightless insects that form the order Siphonaptera.
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.
Fog is a visible aerosol consisting of minute water droplets or ice crystals suspended in the air at or near the Earth's surface.
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The foot (plural feet) is an anatomical structure found in many vertebrates.
The foot (feet; abbreviation: ft; symbol: ′, the prime symbol) is a unit of length in the imperial and US customary systems of measurement.
A football pitch (also known as a football field or soccer field) is the playing surface for the game of association football.
The Fornax Cluster is a cluster of galaxies lying at a distance of 19 megaparsecs (62 million light-years).
Fort Kent is a town in Aroostook County, Maine, United States.
France, officially the French Republic (République française), is a sovereign state whose territory consists of metropolitan France in Western Europe, as well as several overseas regions and territories.
Frederick Reines (March 16, 1918 – August 26, 1998) was an American physicist.
Fresh water (or freshwater) is any naturally occurring water except seawater and brackish water.
The galactic plane is the plane on which the majority of a disk-shaped galaxy's mass lies.
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.
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
A galaxy cluster, or 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 1014–1015 solar masses.
The distribution reveals fine, filamentary structures.
The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto.
A gamma ray or gamma radiation (symbol γ or \gamma), is penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei.
In gamma-ray astronomy, gamma-ray bursts (GRBs) are extremely energetic explosions that have been observed in distant galaxies.
Ganymede (Jupiter III) is the largest and most massive moon of Jupiter and in the Solar System.
A gas giant is a giant planet composed mainly of hydrogen and helium.
The gastrointestinal tract (digestive tract, digestional tract, GI tract, GIT, gut, or alimentary canal) is an organ system within humans and other animals which takes in food, digests it to extract and absorb energy and nutrients, and expels the remaining waste as feces.
The geography of Australia encompasses a wide variety of biogeographic regions being the world's smallest continent but the sixth-largest country in the world.
The geography of Finland is characterized by its northern position, its ubiquitous landscapes of intermingled boreal forests and lakes and its low population density.
Norway is a country located in Northern Europe on the western and northern part of the Scandinavian Peninsula, bordering the North Sea to the southwest and the Skagerrak inlet to the south, the North Atlantic Ocean (Norwegian Sea) in the west and the Barents Sea to the northeast.
Sweden is a country in Northern Europe on the Scandinavian Peninsula.
In mathematics, the geometric mean is a mean or average, which indicates the central tendency or typical value of a set of numbers by using the product of their values (as opposed to the arithmetic mean which uses their sum).
A geostationary orbit, often referred to as a geosynchronous equatorial orbit (GEO), is a circular geosynchronous orbit above Earth's equator and following the direction of Earth's rotation.
The giant squid (genus Architeuthis) is a deep-ocean dwelling squid in the family Architeuthidae.
The giraffe (Giraffa) is a genus of African even-toed ungulate mammals, the tallest living terrestrial animals and the largest ruminants.
Giridih (Hindi: गिरिडीह) is headquarters of the Giridih district of Jharkhand state, India.
Gliese 581d (often shortened to Gl 581d or GJ 581d) is a possible extrasolar planet orbiting within the Gliese 581 system, approximately 20.4 light-years away in the Libra constellation.
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
Glucose is a simple sugar with the molecular formula C6H12O6.
The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the strait connecting San Francisco Bay and the Pacific Ocean.
Golf is a club-and-ball sport in which players use various clubs to hit balls into a series of holes on a course in as few strokes as possible.
A golf ball is a special ball designed to be used in the game of golf.
A googol is the large number 10100.
A googolplex is the number 10, or equivalently, 10.
GQ Lupi b is a possible extrasolar planet or brown dwarf orbiting the star GQ Lupi.
Gram stain or Gram staining, also called Gram's method, is a method of staining used to distinguish and classify bacterial species into two large groups (gram-positive and gram-negative).
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 cell wall.
The Grand Union Canal in England is part of the British canal system.
Graphene is a semi-metal with a small overlap between the valence and the conduction bands (zero bandgap material).
In physics, a gravitational field is a model used to explain the influence that a massive body extends into the space around itself, producing a force on another massive body.
Gravitational waves are the disturbance in the fabric ("curvature") of spacetime generated by accelerated masses and propagate as waves outward from their source at the speed of light.
GRB 980425 was a gamma-ray burst (GRB) that was detected on 25 April 1998 at 21:49 UTC.
GRB 990123 is a gamma-ray burst which was detected on January 23, 1999.
The Great January Comet of 1910, formally designated C/1910 A1 and often referred to as the Daylight Comet,.
The Great Pyramid of Giza (also known as the Pyramid of Khufu or the Pyramid of Cheops) is the oldest and largest of the three pyramids in the Giza pyramid complex bordering what is now El Giza, Egypt.
The Great Red Spot is a persistent high-pressure region in the atmosphere of Jupiter, producing an anticyclonic storm 22° south of the planet's equator.
The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line across the historical northern borders of China to protect the Chinese states and empires against the raids and invasions of the various nomadic groups of the Eurasian Steppe with an eye to expansion.
Green is the color between blue and yellow on the visible spectrum.
Guinness World Records, known from its inception in 1955 until 2000 as The Guinness Book of Records and in previous United States editions as The Guinness Book of World Records, is a reference book published annually, listing world records both of human achievements and the extremes of the natural world.
H1821+643 is a quasar situated within the constellation of Draco.
Hair is a protein filament that grows from follicles found in the dermis.
The hair follicle is a dynamic organ found in mammalian skin.
Halley's Comet or Comet Halley, officially designated 1P/Halley, is a short-period comet visible from Earth every 74–79 years.
Hampshire (abbreviated Hants) is a county on the southern coast of England in the United Kingdom.
The hand is a non-SI unit of measurement of length standardized to.
A hard disk drive (HDD), hard disk, hard drive or fixed disk is an electromechanical data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks (platters) coated with magnetic material.
Haumea, minor-planet designation 136108 Haumea, is a dwarf planet located beyond Neptune's orbit.
Hawaii (Hawaii) is the 50th and most recent state to have joined the United States, having received statehood on August 21, 1959.
HD 100546, also known as KR Muscae, is a star 320 light-years from Earth.
HD 149026 b, also named Smertrios, is an extrasolar planet approximately 250 light-years from the Sun in the constellation of Hercules.
The hectare (SI symbol: ha) is an SI accepted metric system unit of area equal to a square with 100 meter sides, or 10,000 m2, and is primarily used in the measurement of land.
The hectometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: hm) or hectometer (American spelling) is an uncommonly used unit of length in the metric system, equal to one hundred metres.
Helianthus or sunflower is a genus of plants comprising about 70 species Flora of North America.
Helium (from lit) is a chemical element with symbol He and atomic number 2.
A helix, plural helixes or helices, is a type of smooth space curve, i.e. a curve in three-dimensional space.
The Helix Nebula, also known as The Helix, NGC 7293, is a large planetary nebula (PN) located in the constellation Aquarius.
Hemoglobin (American) or haemoglobin (British); abbreviated Hb or Hgb, is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates (with the exception of the fish family Channichthyidae) as well as the tissues of some invertebrates.
High efficiency particulate air (HEPA), originally called high-efficiency particulate absorber but also sometimes called high-efficiency particulate arresting or high-efficiency particulate arrestance, is a type of air filter.
Hercules–Corona Borealis Great Wall or the Great GRB Wall.
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
High Force is a waterfall on the River Tees, near Middleton-in-Teesdale, Teesdale, County Durham, England.
High Speed 1 (HS1), legally the Channel Tunnel Rail Link (CTRL), is a high-speed railway between London and the United Kingdom end of the Channel Tunnel.
High-resolution transmission electron microscopy (HRTEM) (or HREM) is an imaging mode of the transmission electron microscope (TEM) that allows for direct imaging of the atomic structure of the sample.
An astronomical body's Hill sphere is the region in which it dominates the attraction of satellites.
HIP 56948 (also known as HD 101364) is a solar twin star of type G5V.
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
In the aftermath of the French Revolution (1789), the traditional units of measure used in the Ancien Régime were replaced.
The human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and over time acquired immunodeficiency syndrome (AIDS).
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Human immunodeficiency virus infection and acquired immune deficiency syndrome (HIV/AIDS) is a spectrum of conditions caused by infection with the human immunodeficiency virus (HIV).
Homo floresiensis ("Flores Man"; nicknamed "hobbit") is an extinct species in the genus Homo.
Homopus signatus is the world's smallest species of tortoise (family Testudinidae).
Hong Kong (Chinese: 香港), officially the Hong Kong Special Administrative Region of the People's Republic of China, is an autonomous territory of China on the eastern side of the Pearl River estuary in East Asia.
The Horologium Supercluster, also known as Horologium-Reticulum Supercluster, consisting of SCl 48 and SCl 49) is a massive supercluster; spanning about 550 million light-years, it has a mass of 1017 solar masses, similar to that of the Laniakea Supercluster that houses the Milky Way. It is centered on coordinates right ascension and declination, and spans an angular area of 12° × 12°. The nearest part of the supercluster is 700 million light-years (z.
Houlton is a town in Aroostook County, Maine, on the Canada–US border, located at.
House dust mites (HDM, or simply dust mites) are a large number of mites found in association with dust in dwellings.
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.
The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
The Huge Large Quasar Group, (Huge-LQG, also called U1.27) is a possible structure or pseudo-structure of 73 quasars, referred to as a large quasar group, that measures about 4 billion light-years across.
Humans (taxonomically Homo sapiens) are the only extant members of the subtribe Hominina.
The Hume Highway, inclusive of the sections now known as the 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.
Hummingbirds are birds from the Americas that constitute the family Trochilidae.
Hydrogen is a chemical element with symbol H and atomic number 1.
A hydrogen atom is an atom of the chemical element hydrogen.
The hydrogen line, 21-centimeter line or H I line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms.
In atomic physics, hyperfine structure refers to small shifts and splittings in the energy levels of atoms, molecules and ions, due to interaction between the state of the nucleus and the state of the electron clouds.
Iapetus (Ιαπετός), or occasionally Japetus, is the third-largest natural satellite of Saturn, eleventh-largest in the Solar System, and the largest body in the Solar System known not to be in hydrostatic equilibrium.
IC 10 is an irregular galaxy in the constellation Cassiopeia.
IC 1101 is a supergiant elliptical galaxy at the center of the Abell 2029 galaxy cluster, approximately 320 megaparsecs (1.04 billion light-years) from Earth.
The IC 342/Maffei Group (also known as the IC 342 Group or the Maffei 1 Group) is the nearest group of galaxies to the Local Group.
Ice is water frozen into a solid state.
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The inch (abbreviation: in or &Prime) is a unit of length in the (British) imperial and United States customary systems of measurement now formally equal to yard but usually understood as of a foot.
India (IAST), also called the Republic of India (IAST), is a country in South Asia.
The Indianapolis 500 is an automobile race held annually at Indianapolis Motor Speedway in Speedway, Indiana, United States, an enclave suburb of Indianapolis, Indiana.
Indigo is a deep and rich color close to the color wheel blue (a primary color in the RGB color space), as well as to some variants of ultramarine.
In physical cosmology, cosmic inflation, cosmological inflation, or just inflation, is a theory of exponential expansion of space in the early universe.
Infrared radiation (IR) is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye (although IR at wavelengths up to 1050 nm from specially pulsed lasers can be seen by humans under certain conditions). It is sometimes called infrared light.
The Intel 4004 is a 4-bit central processing unit (CPU) released by Intel Corporation in 1971.
The International Association of Athletics Federations (IAAF) is the international governing body for the sport of athletics.
The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international association of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.
The International Space Station (ISS) is a space station, or a habitable artificial satellite, in low Earth orbit.
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
Interstate 90 (I-90) is a transcontinental freeway, and the longest Interstate Highway in the United States at.
Interstate 95 (I-95) is the main Interstate Highway on the East Coast of the United States, running largely parallel to the Atlantic Ocean coast and U.S. Highway 1, serving areas from Florida to Maine.
Invertebrates are animals that neither possess nor develop a vertebral column (commonly known as a backbone or spine), derived from the notochord.
Io (Jupiter I) is the innermost of the four Galilean moons of the planet Jupiter.
Iran (ایران), also known as Persia, officially the Islamic Republic of Iran (جمهوری اسلامی ایران), is a sovereign state in Western Asia. With over 81 million inhabitants, Iran is the world's 18th-most-populous country. Comprising a land area of, it is the second-largest country in the Middle East and the 17th-largest in the world. Iran is bordered to the northwest by Armenia and the Republic of Azerbaijan, to the north by the Caspian Sea, to the northeast by Turkmenistan, to the east by Afghanistan and Pakistan, to the south by the Persian Gulf and the Gulf of Oman, and to the west by Turkey and Iraq. The country's central location in Eurasia and Western Asia, and its proximity to the Strait of Hormuz, give it geostrategic importance. Tehran is the country's capital and largest city, as well as its leading economic and cultural center. Iran is home to one of the world's oldest civilizations, beginning with the formation of the Elamite kingdoms in the fourth millennium BCE. It was first unified by the Iranian Medes in the seventh century BCE, reaching its greatest territorial size in the sixth century BCE, when Cyrus the Great founded the Achaemenid Empire, which stretched from Eastern Europe to the Indus Valley, becoming one of the largest empires in history. The Iranian realm fell to Alexander the Great in the fourth century BCE and was divided into several Hellenistic states. An Iranian rebellion culminated in the establishment of the Parthian Empire, which was succeeded in the third century CE by the Sasanian Empire, a leading world power for the next four centuries. Arab Muslims conquered the empire in the seventh century CE, displacing the indigenous faiths of Zoroastrianism and Manichaeism with Islam. Iran made major contributions to the Islamic Golden Age that followed, producing many influential figures in art and science. After two centuries, a period of various native Muslim dynasties began, which were later conquered by the Turks and the Mongols. The rise of the Safavids in the 15th century led to the reestablishment of a unified Iranian state and national identity, with the country's conversion to Shia Islam marking a turning point in Iranian and Muslim history. Under Nader Shah, Iran was one of the most powerful states in the 18th century, though by the 19th century, a series of conflicts with the Russian Empire led to significant territorial losses. Popular unrest led to the establishment of a constitutional monarchy and the country's first legislature. A 1953 coup instigated by the United Kingdom and the United States resulted in greater autocracy and growing anti-Western resentment. Subsequent unrest against foreign influence and political repression led to the 1979 Revolution and the establishment of an Islamic republic, a political system that includes elements of a parliamentary democracy vetted and supervised by a theocracy governed by an autocratic "Supreme Leader". During the 1980s, the country was engaged in a war with Iraq, which lasted for almost nine years and resulted in a high number of casualties and economic losses for both sides. According to international reports, Iran's human rights record is exceptionally poor. The regime in Iran is undemocratic, and has frequently persecuted and arrested critics of the government and its Supreme Leader. Women's rights in Iran are described as seriously inadequate, and children's rights have been severely violated, with more child offenders being executed in Iran than in any other country in the world. Since the 2000s, Iran's controversial nuclear program has raised concerns, which is part of the basis of the international sanctions against the country. The Joint Comprehensive Plan of Action, an agreement reached between Iran and the P5+1, was created on 14 July 2015, aimed to loosen the nuclear sanctions in exchange for Iran's restriction in producing enriched uranium. Iran is a founding member of the UN, ECO, NAM, OIC, and OPEC. It is a major regional and middle power, and its large reserves of fossil fuels – which include the world's largest natural gas supply and the fourth-largest proven oil reserves – exert considerable influence in international energy security and the world economy. The country's rich cultural legacy is reflected in part by its 22 UNESCO World Heritage Sites, the third-largest number in Asia and eleventh-largest in the world. Iran is a multicultural country comprising numerous ethnic and linguistic groups, the largest being Persians (61%), Azeris (16%), Kurds (10%), and Lurs (6%).
The Iran–Pakistan gas pipeline, also known as the Peace pipeline, or IP Gas, is an under-construction pipeline to deliver natural gas from Iran to Pakistan.
The industrial, scientific and medical (ISM) radio bands are radio bands (portions of the radio spectrum) reserved internationally for the use of radio frequency (RF) energy for industrial, scientific and medical purposes other than telecommunications.
ISO/IEC 7810 Identification cards — Physical characteristics is an international standard that defines the physical characteristics for identification cards.
Italy (Italia), officially the Italian Republic (Repubblica Italiana), is a sovereign state in Europe.
The James Webb Space Telescope (JWST) is a space telescope developed in collaboration between NASA, the European Space Agency, and the Canadian Space Agency that will be the scientific successor to the Hubble Space Telescope.
Javier Sotomayor Sanabria (born October 13, 1967) is a Cuban former track and field athlete, who specialized in the high jump and is the current world record holder.
Jules Gabriel Verne (Longman Pronunciation Dictionary.; 8 February 1828 – 24 March 1905) was a French novelist, poet, and playwright.
Jupiter is the fifth planet from the Sun and the largest in the Solar System.
Kansas State University (KSU), commonly shortened to Kansas State or K-State, is a public research university with its main campus in Manhattan, Kansas, United States.
The Kármán line, or Karman line, lies at an altitude of above Earth's sea level and commonly represents the boundary between Earth's atmosphere and outer space.
Key West (Cayo Hueso) is an island and city in the Straits of Florida on the North American continent, at the southwesternmost end of the roadway through the Florida Keys in the state of Florida, United States.
Kiev or Kyiv (Kyiv; Kiyev; Kyjev) is the capital and largest city of Ukraine, located in the north central part of the country on the Dnieper.
The kilometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: km; or) or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix for). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the road network of the United Kingdom where the statute mile is the official unit used.
Kingda Ka is a steel accelerator roller coaster located at Six Flags Great Adventure in Jackson, New Jersey.
The Kuiper belt, occasionally called the Edgeworth–Kuiper belt, is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune (at 30 AU) to approximately 50 AU from the Sun.
The KVLY-TV mast (formerly the KTHI-TV mast) is a television-transmitting mast in Blanchard, Traill County, North Dakota, United States, used by Fargo station KVLY-TV channel 11.
KY Cygni is a red supergiant of spectral class M3.5Ia located in the constellation Cygnus.
A lake is an area filled with water, localized in a basin, that is surrounded by land, apart from any river or other outlet that serves to feed or drain the lake.
Lake Baikal (p; Байгал нуур, Baigal nuur; Байгал нуур, Baigal nuur, etymologically meaning, in Mongolian, "the Nature Lake") is a rift lake in Russia, located in southern Siberia, between Irkutsk Oblast to the northwest and the Buryat Republic to the southeast.
Lake Geneva (le lac Léman or le Léman, sometimes le lac de Genève, Genfersee) is a lake on the north side of the Alps, shared between Switzerland and France.
The Lake Pontchartrain Causeway, sometimes only the Causeway, is a fixed link composed of two parallel bridges crossing Lake Pontchartrain in southern Louisiana, United States.
Langley Research Center (LaRC or NASA Langley) located in Hampton, Virginia, United States, is the oldest of NASA's field centers.
The Large Hadron Collider (LHC) is the world's largest and most powerful particle collider, the most complex experimental facility ever built and the largest single machine in the world.
The Large Magellanic Cloud (LMC) is a satellite galaxy of the Milky Way.
The Laser Interferometer Space Antenna (LISA) is a European Space Agency mission designed to detect and accurately measure gravitational waves—tiny ripples in the fabric of space-time—from astronomical sources.
In geography, latitude is a geographic coordinate that specifies the north–south position of a point on the Earth's surface.
A league is a unit of length.
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 the cathedral of the Italian city of Pisa, known worldwide for its unintended tilt.
Leda (Λήδα), also known as, is a prograde irregular satellite of Jupiter.
Leedsichthys is a giant member of the Pachycormidae, an extinct group of Mesozoic ray-finned fish that lived in the oceans of the Middle Jurassic period.
In geometric measurements, length is the most extended dimension of an object.
Leo I is a dwarf spheroidal galaxy in the constellation Leo.
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.
The li (lǐ, or 市里, shìlǐ), also known as the Chinese mile, is a traditional Chinese unit of distance.
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.
The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics.
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses and to serve as a navigational aid for maritime pilots at sea or on inland waterways.
The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a large-scale physics experiment and observatory to detect cosmic gravitational waves and to develop gravitational-wave observations as an astronomical tool.
This is a list of examples of lengths, in metres in order to give an understanding of lengths.
Many people have made use of, or invented, units of measurement intended primarily for their humour value.
This is a list of the largest cosmic structures so far discovered.
Below is a list of the largest exoplanets so far discovered, in terms of physical size, ordered by radius.
Below is an ordered list of the largest stars currently known by radius.
Although runway length may be of some academic interest, in terms of usability for airline operations, a runway of at least in length is usually adequate for aircraft weights below approximately.
This is a list of quasars.
The world's tallest artificial structure is the Burj Khalifa in Dubai (of the United Arab Emirates).
This article documents the most distant astronomical objects so far discovered, and the time periods in which they were so classified.
Lithium fluoride is an inorganic compound with the chemical formula LiF.
The litre (SI spelling) or liter (American spelling) (symbols L or l, sometimes abbreviated ltr) is an SI accepted metric system unit of volume equal to 1 cubic decimetre (dm3), 1,000 cubic centimetres (cm3) or 1/1,000 cubic metre. A cubic decimetre (or litre) occupies a volume of 10 cm×10 cm×10 cm (see figure) and is thus equal to one-thousandth of a cubic metre. The original French metric system used the litre as a base unit. The word litre is derived from an older French unit, the litron, whose name came from Greek — where it was a unit of weight, not volume — via Latin, and which equalled approximately 0.831 litres. The litre was also used in several subsequent versions of the metric system and is accepted for use with the SI,, p. 124. ("Days" and "hours" are examples of other non-SI units that SI accepts.) although not an SI unit — the SI unit of volume is the cubic metre (m3). The spelling used by the International Bureau of Weights and Measures is "litre", a spelling which is shared by almost all English-speaking countries. The spelling "liter" is predominantly used in American English. One litre of liquid water has a mass of almost exactly one kilogram, because the kilogram was originally defined in 1795 as the mass of one cubic decimetre of water at the temperature of melting ice. Subsequent redefinitions of the metre and kilogram mean that this relationship is no longer exact.
The liver, an organ only found in vertebrates, detoxifies various metabolites, synthesizes proteins, and produces biochemicals necessary for digestion.
The Local Group is the galaxy group that includes the Milky Way.
London is the capital and most populous city of England and the United Kingdom.
The London Underground (also known simply as the Underground, or by its nickname the Tube) is a public rapid transit system serving London and some parts of the adjacent counties of Buckinghamshire, Essex and Hertfordshire in the United Kingdom.
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.
Loop quantum gravity (LQG) is a theory of quantum gravity, merging quantum mechanics and general relativity.
Los Angeles (Spanish for "The Angels";; officially: the City of Los Angeles; colloquially: by its initials L.A.) is the second-most populous city in the United States, after New York City.
Louisiana is a state in the southeastern region of the United States.
A low Earth orbit (LEO) is an orbit around Earth with an altitude of or less, and with an orbital period of between about 84 and 127 minutes.
The Luxor Obelisk (French: Obélisque de Louxor) is a high Ancient Egyptian obelisk standing at the centre of the Place de la Concorde in Paris, France.
the Lyman-alpha line In physics, the Lyman-alpha line, sometimes written as Ly-α line, is a spectral line of hydrogen, or more generally of one-electron ions, in the Lyman series, emitted when the electron falls from the n.
A lysosome is a membrane-bound organelle found in nearly all animal cells.
The M27 is a motorway in Hampshire, England.
The Madrid Metro (Spanish: Metro de Madrid) is a metro system serving the city of Madrid, capital of Spain.
Maffei 1 is a massive elliptical galaxy in the constellation Cassiopeia.
Major League Baseball (MLB) is a professional baseball organization, the oldest of the four major professional sports leagues in the United States and Canada.
Malin 1 is a giant low surface brightness (LSB) spiral galaxy.
Manhattan is the most densely populated borough of New York City, its economic and administrative center, and its historical birthplace.
The marathon is a long-distance race, completed by running, walking, or a run/walk strategy.
The Mariana Trench or Marianas Trench is the deepest part of the world's oceans.
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.
Marylebone Cricket Club, generally known as the 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, England.
Matter waves are a central part of the theory of quantum mechanics, being an example of wave–particle duality.
Mauna Kea is a dormant volcano on the island of Hawaii.
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 and on the east by the Levant.
Medium wave (MW) is the part of the medium frequency (MF) radio band used mainly for AM radio broadcasting.
Mega is a unit prefix in metric systems of units denoting a factor of one million (106 or 000).
Melbourne is the state capital of Victoria and the second-most populous city in Australia and Oceania.
The first record in the 100 metres for men (athletics) was recognised by the International Amateur Athletics Federation, now known as the International Association of Athletics Federations, in 1912.
Mercury is the smallest and innermost planet in the Solar System.
In geodesy, a meridian arc measurement is the distance between two points with the same longitude, i.e., a segment of a meridian curve or its length.
Mesoporous silica is a mesoporous form of silica and a recent development in nanotechnology.
Messier 13 (M13), also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of several hundred thousand stars in the constellation of Hercules.
Messier 4 or M4 (also designated NGC 6121) is a globular cluster in the constellation of Scorpius.
A meteoroid is a small rocky or metallic body in outer space.
The metre (British spelling and BIPM spelling) or meter (American spelling) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in some metric systems, including the International System of Units (SI).
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit.
The metric system is an internationally adopted decimal system of measurement.
Miami is a major port city on the Atlantic coast of south Florida in the southeastern United States.
Microelectromechanical systems (MEMS, also written as micro-electro-mechanical, MicroElectroMechanical or microelectronic and microelectromechanical systems and the related micromechatronics) is the technology of microscopic devices, particularly those with moving parts.
The micrometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equaling (SI standard prefix "micro-".
A microprocessor is a computer processor that incorporates the functions of a central processing unit on a single integrated circuit (IC), or at most a few integrated circuits.
A microsecond is an SI unit of time equal to one millionth (0.000001 or 10−6 or 1/1,000,000) of a second.
A mid-ocean ridge (MOR) is an underwater mountain system formed by plate tectonics.
Michael "Mike" Anthony Powell (born November 10, 1963) is an American former track and field athlete, and the holder of the long jump world record.
The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959.
The Milky Way is the galaxy that contains our Solar System.
The Millau Viaduct (le Viaduc de Millau) is a cable-stayed bridge that spans the gorge valley of the Tarn near Millau in southern France.
The millimetre (International spelling as used by the International Bureau of Weights and Measures; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length.
A millisecond (from milli- and second; symbol: ms) is a thousandth (0.001 or 10−3 or 1/1000) of a second.
The Mini is a small economy car produced by the English-based British Motor Corporation (BMC) and its successors from 1959 until 2000.
A minor-planet moon is an astronomical object that orbits a minor planet as its natural satellite.
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
Miranda, also designated Uranus V, is the smallest and innermost of Uranus's five round satellites.
The Mississippi River is the chief river of the second-largest drainage system on the North American continent, second only to the Hudson Bay drainage system.
The Missouri River is the longest river in North America.
Mist is a phenomenon caused by small droplets of water suspended in air.
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.
Mont Blanc (Monte Bianco), meaning "White Mountain", is the highest mountain in the Alps and the highest in Europe west of Russia's Caucasus peaks.
The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.
There are 69 known moons of Jupiter.
Mosquitoes are small, midge-like flies that constitute the family Culicidae.
Mount Damavand (دماوند), a potentially active volcano, is a stratovolcano which is the highest peak in Iran and the highest volcano in Asia; the Kunlun Volcanic Group in Tibet is higher than Damāvand, but are not considered to be volcanic mountains.
Mount Elbrus (ɪlʲˈbrus; Минги тау, Miñi taw,; Ӏуащхьэмахуэ, ’Wāśhamāxwa) is the highest mountain in Europe, and the tenth most prominent peak in the world.
Mount Everest, known in Nepali as Sagarmāthā and in Tibetan as Chomolungma, is Earth's highest mountain above sea level, located in the Mahalangur Himal sub-range of the Himalayas.
Mount Kilimanjaro or just Kilimanjaro, with its three volcanic cones, "Kibo", "Mawenzi", and "Shira", is a dormant volcano in Tanzania.
Mount Kosciuszko is Australia’s highest mountain, at 2,228 metres (7,310 ft) above sea level.
Mount Logan is the highest mountain in Canada and the second-highest peak in North America, after Denali.
A mountain range or hill range is a series of mountains or hills ranged in a line and connected by high ground.
Mumbai (also known as Bombay, the official name until 1995) is the capital city of the Indian state of Maharashtra.
The Munda Biddi Trail is an off-road cycling trail in Western Australia, running for over 1000 km from Mundaring to Albany - the longest track of its kind in the world.
Mycoplasma is a genus of bacteria that lack a cell wall around their cell membrane.
Myria- (symbol my) is a now obsolete decimal metric prefix denoting a factor of 104 (ten thousand).
The myriagram (myriagramme) is a former French and metric unit of mass equal to 10,000 grams (myriad being the Greek word for ten thousand).
Naiad (or; Ναϊάδ-ες), also known as Neptune III, is the innermost satellite of Neptune, named after the Naiads of Greek legend.
A nail is a horn-like envelope covering the tips of the fingers and toes in most primates and a few other mammals.
Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying or light-collecting optical instrument, such as a telescope or microscope.
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 metric system, equal to one billionth (short scale) of a metre (m).
A nanosecond (ns) is an SI unit of time equal to one thousand-millionth of a second (or one billionth of a second), that is, 1/1,000,000,000 of a second, or 10 seconds.
The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.
Nashik is an ancient city in the northwest region of Maharashtra in India. Situated on the banks of Godavari river Nashik is best known for being one of Hindu pilgrimage sites, that of Kumbh Mela which is held every 12 years. The city located about 190 km north of state capital Mumbai, is called the "Wine Capital of India" as half of India’s vineyards and wineries are located in Nashik.
The National Basketball Association (NBA) is a men's professional basketball league in North America; composed of 30 teams (29 in the United States and 1 in Canada).
The national highways network of India is a network of trunk roads that is managed and maintained by CPWD, Central Public Works Department, an agency of the Government of India.
The National Highways Development Project (NHDP) is a project to upgrade, rehabilitate and widen major highways in India to a higher standard.
The National Institute of Standards and Technology (NIST) is one of the oldest physical science laboratories in the United States.
A natural satellite or moon is, in the most common usage, an astronomical body that orbits a planet or minor planet (or sometimes another small Solar System body).
A nautical mile is a unit of measurement defined as exactly.
Nepal (नेपाल), officially the Federal Democratic Republic of Nepal (सङ्घीय लोकतान्त्रिक गणतन्त्र नेपाल), is a landlocked country in South Asia located mainly in the Himalayas but also includes parts of the Indo-Gangetic Plain.
Neptune is the eighth and farthest known planet from the Sun in the Solar System.
Nereid is the third-largest moon of Neptune.
Neso (Greek: Νησώ), also known as Neptune XIII, is the outermost natural satellite of Neptune.
A neutrino (denoted by the Greek letter ν) is a fermion (an elementary particle with half-integer spin) that interacts only via the weak subatomic force and gravity.
A neutron star is the collapsed core of a large star which before collapse had a total of between 10 and 29 solar masses.
NGC 2419 (also known as Caldwell 25) is a globular cluster in the constellation Lynx.
NGC 4889 (also known as Coma B) is an E4 supergiant elliptical galaxy.
NGC 604 is an H II region inside the Triangulum Galaxy.
Niagara Falls is the collective name for three waterfalls that straddle the international border between the Canadian province of Ontario and the American state of New York.
The Nile River (النيل, Egyptian Arabic en-Nīl, Standard Arabic an-Nīl; ⲫⲓⲁⲣⲱ, P(h)iaro; Ancient Egyptian: Ḥ'pī and Jtrw; Biblical Hebrew:, Ha-Ye'or or, Ha-Shiḥor) is a major north-flowing river in northeastern Africa, and is commonly regarded as the longest river in the world, though some sources cite the Amazon River as the longest.
NML Cygni or V1489 Cygni is a red hypergiant and one of the largest stars currently known with a radius of or between.
Norden (East Frisian Low Saxon: Nörden) is a town in the district of Aurich, in Lower Saxony, Germany.
North America is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere; it is also considered by some to be a northern subcontinent of the Americas.
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is (subject to the caveats explained below) defined as the point in the Northern Hemisphere where the Earth's axis of rotation meets its surface.
The North Sea (Mare Germanicum) is a marginal sea of the Atlantic Ocean located between Great Britain, Scandinavia, Germany, the Netherlands, Belgium, and France.
Norway (Norwegian: (Bokmål) or (Nynorsk); Norga), officially the Kingdom of Norway, is a unitary sovereign state whose territory comprises the western portion of the Scandinavian Peninsula plus the remote island of Jan Mayen and the archipelago of Svalbard.
In chemistry and physics, a nucleon is either a proton or a neutron, considered in its role as a component of an atomic nucleus.
The observable universe is a spherical region of the Universe comprising all matter that can be observed from Earth at the present time, because electromagnetic radiation from these objects has had time to reach Earth since the beginning of the cosmological expansion.
Oceania is a geographic region comprising Melanesia, Micronesia, Polynesia and Australasia.
OGLE-2005-BLG-390Lb (known sometimes as Hoth by NASA) is a super-Earth exoplanet orbiting OGLE-2005-BLG-390L, a star 21,500 ± 3,300 light years from Earth near the center of the Milky Way.
OGLE-TR-122 is a binary stellar system containing one of the smallest main-sequence stars whose radius has been measured.
OGLE-TR-56 is a dim, distant, magnitude 17 Sun-like star located approximately 1500 parsecs away in the constellation of Sagittarius.
An oil tanker, also known as a petroleum tanker, is a ship designed for the bulk transport of oil or its products.
is the southernmost prefecture of Japan.
Olympus Mons (Latin for Mount Olympus) is a very large shield volcano on the planet Mars.
Om is a river in the south of the Western Siberian plains in Russia.
Omega Centauri (ω Cen or NGC 5139) is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677.
The Oort cloud, named after the Dutch astronomer Jan Oort, sometimes called the Öpik–Oort cloud, is a theoretical cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from.
Orange is the colour between yellow and red on the spectrum of visible light.
In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet.
The Moon orbits Earth in the prograde direction and completes one revolution relative to the stars in about 27.322 days (a sidereal month) and one revolution relative to the Sun in about 29.530 days (a synodic month).
An order of magnitude is an approximate measure of the number of digits that a number has in the commonly-used base-ten number system.
This page is a progressive and labelled list of the SI area orders of magnitude, with certain examples appended to some list objects.
The following are examples of orders of magnitude for different lengths.
Most ordinary human activity takes place at temperatures of this order of magnitude.
The table lists various objects and units by the order of magnitude of their volume.
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.
The outer planets are those planets in the Solar System beyond the asteroid belt, and hence refers to the gas giants and ice giants, which are in order of their distance from the Sun.
Outer space, or just space, is the expanse that exists beyond the Earth and between celestial bodies.
Paedocypris progenetica is a tiny species of cyprinid fish endemic to the Indonesian islands of Sumatra and Bintan where it is found in peat swamps and blackwater streams.
The Paedophryne amauensis is a species of frogs from Papua New Guinea.
Paint is any liquid, liquefiable, or mastic composition that, after application to a substrate in a thin layer, converts to a solid film.
The Palm Jebel Ali is an artificial archipelago in Dubai, United Arab Emirates which began construction in October 2002, was originally planned to be completed by mid-2008 and has been on hold since.
Pan (Πάν) is the innermost moon of Saturn.
The Panama Canal (Canal de Panamá) is an artificial waterway in Panama that connects the Atlantic Ocean with the Pacific Ocean.
Paraceratherium is an extinct genus of hornless rhinoceros, and one of the largest terrestrial mammals that has ever existed.
Paramecium (also Paramoecium) is a genus of unicellular ciliates, commonly studied as a representative of the ciliate group.
The parasang is a historical Iranian unit of itinerant distance, the length of which varied according to terrain and speed of travel.
Paris is the capital and most populous city of France, with an area of and a population of 2,206,488.
The Paris Métro, short for Métropolitain (Métro de Paris), is a rapid transit system in the Paris metropolitan area.
Paris–Brest–Paris (PBP) is a long-distance cycling event.
The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.
A particle accelerator is a machine that uses electromagnetic fields to propel charged particles to nearly light speed and to contain them in well-defined beams.
The particle horizon (also called the cosmological horizon, the comoving horizon (in Dodelson's text), or the cosmic light horizon) is the maximum distance from which particles could have traveled to the observer in the age of the universe.
Particle physics (also high energy physics) is the branch of physics that studies the nature of the particles that constitute matter and radiation.
The Perseus Arm is one of two major spiral arms of the Milky Way galaxy.
Pest is the eastern, mostly flat part of Budapest, Hungary, comprising about two thirds of the city's territory.
Phobos (systematic designation) is the innermost and larger of the two natural satellites of Mars, the other being Deimos.
Phoebe (Greek: Φοίβη Phoíbē) is an irregular satellite of Saturn with a mean diameter of 213 km.
Phospholipids are a class of lipids that are a major component of all cell membranes.
Photographic film is a strip or sheet of transparent plastic film base coated on one side with a gelatin emulsion containing microscopically small light-sensitive silver halide crystals.
Physical cosmology is the study of the largest-scale structures and dynamics of the Universe and is concerned with fundamental questions about its origin, structure, evolution, and ultimate fate.
Physics (from knowledge of nature, from φύσις phýsis "nature") is the natural science that studies matterAt the start of The Feynman Lectures on Physics, Richard Feynman offers the atomic hypothesis as the single most prolific scientific concept: "If, in some cataclysm, all scientific knowledge were to be destroyed one sentence what statement would contain the most information in the fewest words? I believe it is that all things are made up of atoms – little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another..." and its motion and behavior through space and time and that studies the related entities of energy and force."Physical science is that department of knowledge which relates to the order of nature, or, in other words, to the regular succession of events." Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves."Physics is one of the most fundamental of the sciences. Scientists of all disciplines use the ideas of physics, including chemists who study the structure of molecules, paleontologists who try to reconstruct how dinosaurs walked, and climatologists who study how human activities affect the atmosphere and oceans. Physics is also the foundation of all engineering and technology. No engineer could design a flat-screen TV, an interplanetary spacecraft, or even a better mousetrap without first understanding the basic laws of physics. (...) You will come to see physics as a towering achievement of the human intellect in its quest to understand our world and ourselves."Physics is an experimental science. Physicists observe the phenomena of nature and try to find patterns that relate these phenomena.""Physics is the study of your world and the world and universe around you." Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. Over the last two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the scientific revolution in the 17th century, these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy. Advances in physics often enable advances in new technologies. For example, advances in the understanding of electromagnetism and nuclear physics led directly to the development of new products that have dramatically transformed modern-day society, such as television, computers, domestic appliances, and nuclear weapons; advances in thermodynamics led to the development of industrialization; and advances in mechanics inspired the development of calculus.
The number is a mathematical constant.
New!!: Orders of magnitude (length) and Pi ·
The piano is an acoustic, stringed musical instrument invented in Italy by Bartolomeo Cristofori around the year 1700 (the exact year is uncertain), in which the strings are struck by hammers.
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 metric system, equal to, or one trillionth of a metre, which is the SI base unit of length.
A picosecond is an SI unit of time equal to 10−12 or 1/1,000,000,000,000 (one trillionth) of a second.
A pine is any conifer in the genus Pinus,, of the family Pinaceae.
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.
The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy distanced 21 million light-years (six megaparsecs) away from Earth in the constellation Ursa Major.
Pioneer 10 (originally designated Pioneer F) is an American space probe, launched in 1972 and weighing, that completed the first mission to the planet Jupiter.
Pioneer 11 (also known as Pioneer G) is a robotic space probe launched by NASA on April 6, 1973 to study the asteroid belt, the environment around Jupiter and Saturn, solar wind and cosmic rays.
The Pisces–Cetus Supercluster Complex is a galaxy filament.
In digital imaging, a pixel, pel, dots, or picture element is a physical point in a raster image, or the smallest addressable element in an all points addressable display device; so it is the smallest controllable element of a picture represented on the screen.
The Place de la Concorde is one of the major public squares in Paris, France.
Planck was a space observatory operated by the European Space Agency (ESA) from 2009 to 2013, which mapped the anisotropies of the cosmic microwave background (CMB) at microwave and infra-red frequencies, with high sensitivity and small angular resolution.
In physics, the Planck length, denoted, is a unit of length, equal to metres.
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
Pluto (minor planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune.
Popular Mechanics is a classic magazine of popular science and technology.
The potato is a starchy, tuberous crop from the perennial nightshade Solanum tuberosum.
In particle physics, preons are point particles, conceived of as subcomponents of quarks and leptons.
Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues.
Proteus (Greek: Πρωτεύς), also known as Neptune VIII, is the second-largest Neptunian moon, and Neptune's largest inner satellite.
Proxima Centauri, or Alpha Centauri C, is a red dwarf, a small low-mass star, about from the Sun in the constellation of Centaurus.
Prudhoe Bay or Sagavanirktok is a census-designated place (CDP) located in North Slope Borough in the U.S. state of Alaska.
PSR B1257+12, previously designated PSR 1257+12, alternatively designated PSR J1300+1240, also named Lich, is a pulsar located 2,300 light years from the Sun in the constellation of Virgo.
PSR B1620-26 b is an extrasolar planet located approximately 12,400 light-years away from Earth in the constellation of Scorpius.
PSR B1919+21 is a pulsar with a period of 1.3373 seconds and a pulse width of 0.04 seconds.
Pterosaurs (from the Greek πτερόσαυρος,, meaning "winged lizard") were flying reptiles of the extinct clade or order Pterosauria.
Puncak Jaya or Carstensz Pyramid (4,884 m) is the highest summit of Mount Jayawijaya or Mount Carstensz in the Sudirman Range of the western central highlands of Papua Province, Indonesia (within Puncak Jaya Regency).
Pune, formerly spelled Poona (1857–1978), is the second largest city in the Indian state of Maharashtra, after Mumbai.
The Pyramid of Djoser (or Djeser and Zoser), or step pyramid (kbhw-ntrw in Egyptian) is an archeological remain in the Saqqara necropolis, Egypt, northwest of the city of Memphis.
The Pyrenees (Pirineos, Pyrénées, Pirineus, Pirineus, Pirenèus, Pirinioak) is a range of mountains in southwest Europe that forms a natural border between Spain and France.
Quail eggs are considered a delicacy in many parts of the world, including Asia, Europe, and North America.
Quantum foam (or spacetime foam) is the fluctuation of spacetime on very small scales due to quantum mechanics.
A quark is a type of elementary particle and a fundamental constituent of matter.
Quartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2.
A quasar (also known as a QSO or quasi-stellar object) is an extremely luminous active galactic nucleus (AGN).
Ornithoptera alexandrae, the Queen Alexandra's birdwing, is the largest butterfly in the world, with females reaching wingspans slightly in excess of 25 cm (9.8 inches).
Quetzalcoatlus northropi is a pterosaur known from the Late Cretaceous of North America (Maastrichtian stage) and one of the largest-known flying animals of all time.
The quintal or centner is a historical unit of mass in many countries which is usually defined as 100 base units of either pounds or kilograms.
Rabies is a viral disease that causes inflammation of the brain in humans and other mammals.
Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width.
Rail transport is a means of transferring of passengers and goods on wheeled vehicles running on rails, also known as tracks.
Rapier or espada ropera, is a loose term for a type of slender, sharply pointed sword.
Red is the color at the end of the visible spectrum of light, next to orange and opposite violet.
New!!: Orders of magnitude (length) and Red ·
Red blood cells-- also known as RBCs, red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes (from Greek erythros for "red" and kytos for "hollow vessel", with -cyte translated as "cell" in modern usage), are the most common type of blood cell and the vertebrate's principal means of delivering oxygen (O2) to the body tissues—via blood flow through the circulatory system.
A red dwarf (or M dwarf) is a small and relatively cool star on the main sequence, of M spectral type.
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.
The Red Sea (also the Erythraean Sea) is a seawater inlet of the Indian Ocean, lying between Africa and Asia.
In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.
Regulus, also designated Alpha Leonis (α Leonis, abbreviated Alpha Leo, α Leo), is the brightest star in the constellation of Leo and one of the brightest stars in the night sky, lying approximately 79 light years from the Sun.
Reptiles are tetrapod animals in the class Reptilia, comprising today's turtles, crocodilians, snakes, amphisbaenians, lizards, tuatara, and their extinct relatives.
Rice is the seed of the grass species Oryza sativa (Asian rice) or Oryza glaberrima (African rice).
Rigel, also designated Beta Orionis (β Orionis, abbreviated Beta Ori, β Ori), is generally the seventh-brightest star in the night sky and the brightest star in the constellation of Orion—though periodically it is outshone within the constellation by the variable Betelgeuse.
A road train or land train is a trucking vehicle of a type used in rural and remote areas of Australia, Europe, and the United States, to move freight efficiently.
Robert Pershing Wadlow (February 22, 1918 – July 15, 1940), also known as the Alton Giant and the Giant of Illinois, was an American who became famous as the tallest person in recorded history for whom there is irrefutable evidence.
A robotic spacecraft is an uncrewed spacecraft, usually under telerobotic control.
Rome (Roma; Roma) is the capital city of Italy and a special comune (named Comune di Roma Capitale).
Rubik's Cube is a 3-D combination puzzle invented in 1974 by Hungarian sculptor and professor of architecture Ernő Rubik.
A ruler, sometimes called a rule or line gauge, is a device with equally spaced markings along its length, used in geometry, technical drawing, engineering and building to measure distances or to rule straight lines.
Russia (rɐˈsʲijə), officially the Russian Federation (p), is a country in Eurasia. At, Russia is the largest country in the world by area, covering more than one-eighth of the Earth's inhabited land area, and the ninth most populous, with over 144 million people as of December 2017, excluding Crimea. About 77% of the population live in the western, European part of the country. Russia's capital Moscow is one of the largest cities in the world; other major cities include Saint Petersburg, Novosibirsk, Yekaterinburg and Nizhny Novgorod. Extending across the entirety of Northern Asia and much of Eastern Europe, Russia spans eleven time zones and incorporates a wide range of environments and landforms. From northwest to southeast, Russia shares land borders with Norway, Finland, Estonia, Latvia, Lithuania and Poland (both with Kaliningrad Oblast), Belarus, Ukraine, Georgia, Azerbaijan, Kazakhstan, China, Mongolia and North Korea. It shares maritime borders with Japan by the Sea of Okhotsk and the U.S. state of Alaska across the Bering Strait. The East Slavs emerged as a recognizable group in Europe between the 3rd and 8th centuries AD. Founded and ruled by a Varangian warrior elite and their descendants, the medieval state of Rus arose in the 9th century. In 988 it adopted Orthodox Christianity from the Byzantine Empire, beginning the synthesis of Byzantine and Slavic cultures that defined Russian culture for the next millennium. Rus' ultimately disintegrated into a number of smaller states; most of the Rus' lands were overrun by the Mongol invasion and became tributaries of the nomadic Golden Horde in the 13th century. The Grand Duchy of Moscow gradually reunified the surrounding Russian principalities, achieved independence from the Golden Horde. By the 18th century, the nation had greatly expanded through conquest, annexation, and exploration to become the Russian Empire, which was the third largest empire in history, stretching from Poland on the west to Alaska on the east. Following the Russian Revolution, the Russian Soviet Federative Socialist Republic became the largest and leading constituent of the Union of Soviet Socialist Republics, the world's first constitutionally socialist state. The Soviet Union played a decisive role in the Allied victory in World War II, and emerged as a recognized superpower and rival to the United States during the Cold War. The Soviet era saw some of the most significant technological achievements of the 20th century, including the world's first human-made satellite and the launching of the first humans in space. By the end of 1990, the Soviet Union had the world's second largest economy, largest standing military in the world and the largest stockpile of weapons of mass destruction. Following the dissolution of the Soviet Union in 1991, twelve independent republics emerged from the USSR: Russia, Ukraine, Belarus, Kazakhstan, Uzbekistan, Armenia, Azerbaijan, Georgia, Kyrgyzstan, Moldova, Tajikistan, Turkmenistan and the Baltic states regained independence: Estonia, Latvia, Lithuania; the Russian SFSR reconstituted itself as the Russian Federation and is recognized as the continuing legal personality and a successor of the Soviet Union. It is governed as a federal semi-presidential republic. The Russian economy ranks as the twelfth largest by nominal GDP and sixth largest by purchasing power parity in 2015. Russia's extensive mineral and energy resources are the largest such reserves in the world, making it one of the leading producers of oil and natural gas globally. The country is one of the five recognized nuclear weapons states and possesses the largest stockpile of weapons of mass destruction. Russia is a great power as well as a regional power and has been characterised as a potential superpower. It is a permanent member of the United Nations Security Council and an active global partner of ASEAN, as well as a member of the G20, the Shanghai Cooperation Organisation (SCO), the Council of Europe, the Asia-Pacific Economic Cooperation (APEC), the Organization for Security and Co-operation in Europe (OSCE), and the World Trade Organization (WTO), as well as being the leading member of the Commonwealth of Independent States (CIS), the Collective Security Treaty Organization (CSTO) and one of the five members of the Eurasian Economic Union (EEU), along with Armenia, Belarus, Kazakhstan and Kyrgyzstan.
Ruthenium is a chemical element with symbol Ru and atomic number 44.
Sagittarius A* (pronounced "Sagittarius A-star", standard abbreviation Sgr A*) is a bright and very compact astronomical radio source at the center of the Milky Way, near the border of the constellations Sagittarius and Scorpius.
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.
Salamanders are a group of amphibians typically characterized by a lizard-like appearance, with slender bodies, blunt snouts, short limbs projecting at right angles to the body, and the presence of a tail in both larvae and adults.
Salt, table salt or common salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in its natural form as a crystalline mineral is known as rock salt or halite.
San Diego (Spanish for 'Saint Didacus') is a major city in California, United States.
San Francisco (initials SF;, Spanish for 'Saint Francis'), officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California.
Sand is a naturally occurring granular material composed of finely divided rock and mineral particles.
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).
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.
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 American states of Oklahoma, Wyoming, and Texas.
Savudrija is a coastal settlement in northwestern Istria, Croatia.
A Scandinavian mile (Norwegian and mil,, like "meal") is a unit of length common in Norway and Sweden, but not Denmark.
The Schwarzschild radius (sometimes historically referred to as the gravitational radius) is a physical parameter that shows up in the Schwarzschild solution to Einstein's field equations, corresponding to the radius defining the event horizon of a Schwarzschild black hole.
Scientific American (informally abbreviated SciAm) is an American popular science magazine.
Scud is the name of a series of tactical ballistic missiles developed by the Soviet Union during the Cold War.
The Sculptor Galaxy, also known as the Silver Coin or Silver Dollar Galaxy, NGC 253, is an intermediate spiral galaxy in the constellation Sculptor.
The Sculptor Group is a loose group of galaxies near the south galactic pole.
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, completed in late 2000.
Seawise Giant, later Happy Giant, Jahre Viking, Knock Nevis, Oppama, and finally Mont, was a ULCC supertanker that was the longest ship ever built.
The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 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.
The is a 53.85 km (33.46 mi) dual gauge railway tunnel in Japan, with a 23.3 km (14.5 mi) long portion under the seabed.
Semiconductor device fabrication is the process used to create the integrated circuits that are present in everyday electrical and electronic devices.
Sequoia sempervirens Sunset Western Garden Book, 1995:606–607 is the sole living species of the genus Sequoia in the cypress family Cupressaceae (formerly treated in Taxodiaceae).
The shape of the universe is the local and global geometry of the universe.
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.
Shortwave radio is radio transmission using shortwave radio frequencies.
The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units can be derived.
Sicily (Sicilia; Sicìlia) is the largest island in the Mediterranean Sea.
Silk is a natural protein fiber, some forms of which can be woven into textiles.
Silt is granular material of a size between sand and clay, whose mineral origin is quartz and feldspar.
Silver is a chemical element with symbol Ag (from the Latin argentum, derived from the Proto-Indo-European ''h₂erǵ'': "shiny" or "white") and atomic number 47.
Sirius (a romanization of Greek Σείριος, Seirios,."glowing" or "scorching") is a star system and the brightest star in the Earth's night sky.
Skin is the soft outer tissue covering vertebrates.
The Sky Tower is an observation and telecommunications tower located at the corner of Victoria and Federal Streets in the Auckland CBD, Auckland, New Zealand.
The Sloan Great Wall (SGW) is a cosmic structure formed by a giant wall of galaxies (a galaxy filament).
Slovenia (Slovenija), officially the Republic of Slovenia (Slovene:, abbr.: RS), is a country in southern Central Europe, located at the crossroads of main European cultural and trade routes.
The Small Magellanic Cloud (SMC), or Nubecula Minor, is a dwarf galaxy near the Milky Way.
Smoke is a collection of airborne solid and liquid 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.
SN 1987A was a peculiar type II supernova in the Large Magellanic Cloud, a dwarf galaxy satellite of the Milky Way.
Sodium chloride, also known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.
The Sognefjord or Sognefjorden, nicknamed the King of the Fjords, is the largest and deepest fjord in Norway.
Solar-type star, solar analogs (also analogues), and solar twins are stars that are particularly similar to the Sun.
The Solar SystemCapitalization of the name varies.
The Sombrero Galaxy (also known as Messier Object 104, M104 or NGC 4594) is a spiral galaxy in the constellation Virgo located from Earth.
In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid.
South America is a continent in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere.
The Southern Hemisphere is the half of Earth that is south of the Equator.
Space is the boundless three-dimensional extent in which objects and events have relative position and direction.
Spaceflight (also written space flight) is ballistic flight into or through outer space.
Spain (España), officially the Kingdom of Spain (Reino de España), is a sovereign state mostly located on the Iberian Peninsula in Europe.
The speed of light in vacuum, commonly denoted, is a universal physical constant important in many areas of physics.
The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.
Sperm is the male reproductive cell and is derived from the Greek word (σπέρμα) sperma (meaning "seed").
The sperm whale (Physeter macrocephalus) or cachalot is the largest of the toothed whales and the largest toothed predator.
A spermatozoon (pronounced, alternate spelling spermatozoön; plural spermatozoa; from σπέρμα "seed" and ζῷον "living being") is a motile sperm cell, or moving form of the haploid cell that is the male gamete.
Sphaerodactylus ariasae, commonly called the Jaragua sphaero or the Jaragua dwarf gecko, is a very small species of lizard in the family Sphaerodactylidae.
A sphere (from Greek σφαῖρα — sphaira, "globe, ball") is a perfectly round geometrical object in three-dimensional space that is the surface of a completely round ball (viz., analogous to the circular objects in two dimensions, where a "circle" circumscribes its "disk").
Spider silk is a protein fibre spun by spiders.
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, form part of the Hubble sequence.
Split Point Lighthouse is a lighthouse located in Aireys Inlet, a small town on the Great Ocean Road, Victoria, Australia.
In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, or (100-gradian angles or right angles). It can also be defined as a rectangle in which two adjacent sides have equal length. A square with vertices ABCD would be denoted.
Square kilometre (International spelling as used by the International Bureau of Weights and Measures) or square kilometer (American spelling), symbol km2, is a multiple of the square metre, the SI unit of area or surface area.
A standard-gauge railway is a railway with a track gauge of.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
Bumble Bee II was the world's smallest piloted airplane.
The Statue of Liberty (Liberty Enlightening the World; La Liberté éclairant le monde) is a colossal neoclassical sculpture on Liberty Island in New York Harbor in New York City, in the United States.
Stephan's Quintet is a visual grouping of five galaxies of which four form the first compact galaxy group ever discovered.
The stere or stère is a unit of volume in the original metric system equal to one cubic metre.
The Stingray Nebula (Hen 3-1357) is the youngest known planetary nebula (PN).
Stockholm is the capital of Sweden and the most populous city in the Nordic countries; 952,058 people live in the municipality, approximately 1.5 million in the urban area, and 2.3 million in the metropolitan area.
The Strait of Dover or Dover Strait, historically known as the Dover Narrows (pas de Calais - Strait of Calais); Nauw van Kales or Straat van Dover), is the strait at the narrowest part of the English Channel, marking the boundary between the Channel and North Sea, separating Great Britain from continental Europe. The shortest distance across the strait,, is from the South Foreland, northeast of Dover in the English county of Kent, to Cap Gris Nez, a cape near to Calais in the French département of Pas-de-Calais. Between these points lies the most popular route for cross-channel swimmers. The entire strait is within the territorial waters of France and the United Kingdom, but a right of transit passage under the UNCLOS exists allowing unrestricted shipping. On a clear day, it is possible to see the opposite coastline of England from France and vice versa with the naked eye, with the most famous and obvious sight being the white cliffs of Dover from the French coastline and shoreline buildings on both coastlines, as well as lights on either coastline at night, as in Matthew Arnold's poem "Dover Beach".
The Strait of Gibraltar (مضيق جبل طارق, Estrecho de Gibraltar) is a narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates Gibraltar and Peninsular Spain in Europe from Morocco and Ceuta (Spain) in Africa.
The Strait of Messina (Stretto di Messina), is a narrow strait between the eastern tip of Sicily (Punta del Faro) and the western tip of Calabria (Punta Pezzo) in the south of Italy.
The stratosphere is the second major layer of Earth's atmosphere, just above the troposphere, and below the mesosphere.
In physics, a string is a physical phenomenon that appears in string theory and related subjects.
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.
thumb The Suez Canal (قناة السويس) is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez.
Sugar is the generic name for sweet-tasting, soluble carbohydrates, many of which are used in food.
Sulfur or sulphur is a chemical element with symbol S and atomic number 16.
The Sun is the star at the center of the Solar System.
New!!: Orders of magnitude (length) and Sun ·
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.
The sunflower seed is the fruit of the sunflower (Helianthus annuus).
A supercluster is a large group of smaller galaxy clusters or galaxy groups; it is among the largest-known structures of the cosmos.
A supermassive black hole (SMBH or SBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses, and is found in the centre of almost all currently known massive galaxies.
A supernova (plural: supernovae or supernovas, abbreviations: SN and SNe) is a transient astronomical event that occurs during the last stellar evolutionary stages of a star's life, either a massive star or a white dwarf, whose destruction is marked by one final, titanic explosion.
Supersaurus (meaning "super lizard") is a genus of diplodocid sauropod dinosaur first discovered by Vivian Jones of Delta, Colorado, in late Jurassic period rocks of the middle Morrison Formation of Colorado in 1972, and later in Portugal under the name S. lourinhanensis.
A surgical mask, also known as a procedure mask, is intended to be worn by health professionals during surgery and during nursing to catch the bacteria shed in liquid droplets and aerosols from the wearer's mouth and nose.
A suspension bridge is a type of bridge in which the deck (the load-bearing portion) is hung below suspension cables on vertical suspenders.
Sweden (Sverige), officially the Kingdom of Sweden (Swedish), is a Scandinavian country in Northern Europe.
Sydney is the state capital of New South Wales and the most populous city in Australia and Oceania.
The Tanggula (Chinese: 唐古拉山, p Tánggǔlāshān, or 唐古拉山脉, p Tánggǔlāshānmài), Tangla, Tanglha, or Dangla Mountains (Tibetan: གདང་ལ་།, w Gdang La, z Dang La) are a mountain range in the central part of the Tibetan Plateau in Tibet.
The Tanggu La, Tangla Pass, or Tanggu Pass is a wide mountain pass over 5000 metres elevation in China used by the Qinghai–Tibet Highway and Qinghai–Tibet Railway to cross the Tanggula Mountains.
The Tarantula Nebula (also known as 30 Doradus) is an H II region in the Large Magellanic Cloud (LMC).
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.
Technetium is a chemical element with symbol Tc and atomic number 43.
A tennis court is the venue where the sport of tennis is played.
The Astronomical Journal (often abbreviated AJ in scientific papers and references) is a peer-reviewed monthly scientific journal owned by the American Astronomical Society and currently published by IOP Publishing.
The Astrophysical Journal, often abbreviated ApJ (pronounced "ap jay") in references and speech, is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler.
The New York Times Building is a skyscraper on the west side of Midtown Manhattan, New York City that was completed in 2007.
The Sydney Morning Herald (SMH) is a daily compact newspaper published by Fairfax Media in Sydney, Australia.
The World or The World Islands (Arabic: جزر العالم; Juzur al-Ālam) is an artificial archipelago of various small islands constructed in the rough shape of a world map, located in the waters of the Persian Gulf, off the coast of Dubai, United Arab Emirates.
Themisto (from Greek: Θεμιστώ), also known as, is a small prograde irregular satellite of Jupiter.
Thiomargarita namibiensis is a gram-negative coccoid Proteobacterium, found in the ocean sediments of the continental shelf of Namibia.
Thorius arboreus (common name: Arboreal minute salamander) is a species of salamander in the family Plethodontidae.
A thousandth of an inch is a derived unit of length in an inch-based system of units.
The Three Gorges Dam is a hydroelectric gravity dam that spans the Yangtze River by the town of Sandouping, in Yiling District, Yichang, Hubei province, China.
Thulium is a chemical element with symbol Tm and atomic number 69.
Titan is the largest moon of Saturn.
The titan beetle (Titanus giganteus) is a neotropical longhorn beetle, the only one in the genus Titanus, and one of the largest known beetles.
Tobacco mosaic virus (TMV) is a positive-sense single stranded RNA virus, genus tobamovirus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae.
The tonne (Non-SI unit, symbol: t), commonly referred to as the metric ton in the United States, is a non-SI metric unit of mass equal to 1,000 kilograms;.
The top quark, also known as the t quark (symbol: t) or truth quark, is the most massive of all observed elementary particles.
The Trans-Canada Highway (French: Route Transcanadienne) is a transcontinental federal-provincial highway system that travels through all ten provinces of Canada from the Pacific Ocean on the west to the Atlantic on the east.
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 (semi-major axis) than Neptune, 30 astronomical units (AU).
The Trans-Siberian Railway (TSR, p) is a network of railways connecting Moscow with the Russian Far East.
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.
TRAPPIST-1, also designated as 2MASS J23062928-0502285, is an ultra-cool red dwarf star that is slightly larger, but much more massive, than the planet Jupiter; it is located from the Sun, in the direction described as the constellation Aquarius.
In botany, a tree is a perennial plant with an elongated stem, or trunk, supporting branches and leaves in most species.
TrES-4b is an extrasolar planet, and one of the largest exoplanets ever found, after WASP-12b, WASP-17b, CT Chamaeleontis b (though the latter may be a brown dwarf) and GQ Lupi b. It was discovered in 2006, and announced in 2007, by the Trans-Atlantic Exoplanet Survey, using the transit method.
Triton is the largest natural satellite of the planet Neptune, and the first Neptunian moon to be discovered.
The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place.
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.
Turkey (Türkiye), officially the Republic of Turkey (Türkiye Cumhuriyeti), is a transcontinental country in Eurasia, mainly in Anatolia in Western Asia, with a smaller portion on the Balkan peninsula in Southeast Europe.
A turn is an element of secondary structure in proteins where the polypeptide chain reverses its overall direction.
Turtles are diapsids of the order Testudines (or Chelonii) characterized by a special bony or cartilaginous shell developed from their ribs and acting as a shield.
Twenty Thousand Leagues Under the Sea: A Tour of the Underwater World (Vingt mille lieues sous les mers: Tour du monde sous-marin, "Twenty Thousand Leagues Under the Seas: A Tour of the Underwater World") is a classic science fiction adventure novel by French writer Jules Verne published in 1870.
A twip (abbreviating "twentieth of a point", "twentieth of an inch point", or "twentieth of an Imperial point") is a typographical measurement, defined as 1/20 of a typographical point.
U.S. Route 1 (US 1) is a major north–south U.S. Highway that serves the East Coast of the United States.
UDFj-39546284 is the designation given to a stellar structure reported on January 27, 2011, as light from the oldest object detected through infrared observation within the Hubble Space Telescope.
The Union of European Football Associations (UEFA; Union des Associations Européennes de Football; Vereinigung Europäischer Fußballverbände) is the administrative body for association football in Europe, although several member states are primarily or entirely located in Asia.
UEFA stadium categories are categories for football stadiums laid out in the UEFA Stadium Infrastructure Regulations.
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 decimeter.
ULPA is an acronym for "Ultra Low Penetration Air (filter)" An ULPA filter can remove from the air at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a size of 100 nanometres (0.1 µm) or larger.
Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.
Ulysses is a decommissioned robotic space probe whose primary mission was to orbit the Sun and study it at all latitudes.
A unit of measurement 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.
The United States of America (USA), commonly known as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.
The United States Department of Commerce is the Cabinet department of the United States government concerned with promoting economic growth.
The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.
The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public research university in Berkeley, California.
The University of California, San Diego is a public research university located in the La Jolla neighborhood of San Diego, California, in the United States.
The University of Nebraska–Lincoln, often referred to as Nebraska, UNL or NU, is a public research university in the city of Lincoln, in the state of Nebraska in the Midwestern United States.
The University of Wisconsin Press (sometimes abbreviated as UW Press) is a non-profit university press publishing peer-reviewed books and journals.
The up quark or u quark (symbol: u) is the lightest of all quarks, a type of elementary particle, and a major constituent of matter.
Uranus is the seventh planet from the Sun.
UY Scuti is a red supergiant and pulsating variable star in the constellation Scutum.
Vacuum is space devoid of matter.
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.
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.
Vega, also designated Alpha Lyrae (α Lyrae, abbreviated Alpha Lyr or α Lyr), is the brightest star in the constellation of Lyra, the fifth-brightest star in the night sky, and the second-brightest star in the northern celestial hemisphere, after Arcturus.
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.
Venezuela, officially denominated Bolivarian Republic of Venezuela (República Bolivariana de Venezuela),Previously, the official name was Estado de Venezuela (1830–1856), República de Venezuela (1856–1864), Estados Unidos de Venezuela (1864–1953), and again República de Venezuela (1953–1999).
Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.
Vertebrates comprise all species of animals within the subphylum Vertebrata (chordates with backbones).
Victoria (abbreviated as Vic) is a state in south-eastern Australia.
Victoria, the capital city of the Canadian province of British Columbia, is on the southern tip of Vancouver Island off Canada's Pacific coast.
Vinson Massif is a large mountain massif in Antarctica that is long and wide and lies within the Sentinel Range of the Ellsworth Mountains.
The viola is a string instrument that is bowed or played with varying techniques.
Violet is the color at the end of the visible spectrum of light between blue and the invisible ultraviolet.
The violin, also known informally as a fiddle, is a wooden string instrument in the violin family.
The Virgo Cluster is a cluster of galaxies whose center is 53.8 ± 0.3 Mly (16.5 ± 0.1 Mpc) away in the constellation Virgo.
The Virgo Supercluster (Virgo SC) or the Local Supercluster (LSC or LS) is a mass concentration of galaxies containing the Virgo Cluster and Local Group, which in turn contains the Milky Way and Andromeda galaxies.
A virus is a small infectious agent that replicates only inside the living cells of other organisms.
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
Vladivostok (p, literally ruler of the east) is a city and the administrative center of Primorsky Krai, Russia, located around the Golden Horn Bay, not far from Russia's borders with China and North Korea.
The Volga (p) is the longest river in Europe.
The Volvo P1800 is a 2+2, front-engine, rear-drive sports car manufactured and marketed by Volvo Cars between 1961-1973.
Voyager 1 is a space probe launched by NASA on September 5, 1977.
Voyager 2 is a space probe launched by NASA on August 20, 1977, to study the outer planets.
VY Canis Majoris (VY CMa) is an extreme pulsating red hypergiant (or supergiant) star located in the constellation Canis Major.
The wandering albatross, snowy albatross, white-winged albatross or goonieRobertson, C. J. R. (2003) (Diomedea exulans) is a large seabird from the family Diomedeidae, which has a circumpolar range in the Southern Ocean.
The Warsaw Radio Mast was the world's tallest structure from 1974 until its collapse on 8 August 1991.
Washington, D.C., formally the District of Columbia and commonly referred to as Washington or D.C., is the capital of the United States of America.
WASP-12b is an extrasolar planet orbiting the star WASP-12, discovered by the SuperWASP planetary transit survey.
WASP-79b is an extrasolar planet orbiting the star CD-30 1812.
Water is a transparent, tasteless, odorless, and nearly colorless chemical substance that is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms.
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
In particle physics, the weak interaction (the weak force or weak nuclear force) is the mechanism of interaction between sub-atomic particles that causes radioactive decay and thus plays an essential role in nuclear fission.
Western Australia (abbreviated as WA) is a state occupying the entire western third of Australia.
The whale shark (Rhincodon typus) is a slow-moving, filter-feeding carpet shark and the largest known extant fish species.
A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter.
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 relatives).
The Wilkinson Microwave Anisotropy Probe (WMAP), originally known as the Microwave Anisotropy Probe (MAP), was a 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.
The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the other wingtip.
Wool is the textile fiber obtained from sheep and other animals, including cashmere and mohair from goats, qiviut from muskoxen, angora from rabbits, and other types of wool from camelids.
A world map is a map of most or all of the surface of the Earth.
X-rays make up X-radiation, a form of electromagnetic radiation.
Xinhua News Agency (English pronunciation: J. C. Wells: Longman Pronunciation Dictionary, 3rd ed., for both British and American English) or New China News Agency is the official state-run press agency of the People's Republic of China.
The Yangtze, which is 6,380 km (3,964 miles) long, is the longest river in Asia and the third-longest in the world.
The yard (abbreviation: yd) is an English unit of length, in both the British imperial and US customary systems of measurement, that comprises 3 feet or 36 inches.
Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom.
Yellow is the color between orange and green on the spectrum of visible light.
The Yellow River or Huang He is the second longest river in Asia, after the Yangtze River, and the sixth longest river system in the world at the estimated length of.
Zirconium is a chemical element with symbol Zr and atomic number 40.
In semiconductor fabrication, the International Technology Roadmap for Semiconductors (ITRS) defines the 10 nanometer (10 nm) node as the technology node following the 14 nm node. "10 nm class" denotes chips made using process technologies between 10 and 20 nanometers. All production "10 nm" processes are based on silicon CMOS finFET technology. "10nm" chip production started in 2016; product shipments started in 2017.
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.
The 1000 km Buenos Aires was an endurance sports car event held in Buenos Aires, Argentina.
The 1000 kilometres of Monza (which from 1966 was known as "Trofeo Filippo Caracciolo") was an endurance race, mainly for sports cars, held at Autodromo Nazionale Monza in Italy.
The Summer Endurance Race is an annual endurance race currently held for ten hours but at times has been a 500km, 700km, or 1000km endurance race, for sports cars held at the Suzuka Circuit.
The 1000 km Zeltweg (originally known as the 500 km Zeltweg) was an endurance sports car event held near Zeltweg, Austria.
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 2.5 kilometers.
The Dogger Bank earthquake of 1931 was the strongest earthquake recorded in the United Kingdom since measurements began.
2008 HJ is a sub-kilometer asteroid, classified as near-Earth object of the Apollo group.
(Catalina Sky Survey temporary designation 8TA9D69) was an, diameter asteroid that entered Earth's atmosphere on October 7, 2008.
The 24 Hours of Le Mans (24 Heures du Mans) is the world's oldest active sports car race in endurance racing, held annually since near the town of Le Mans, France.
243 Ida is an asteroid in the Koronis family of the asteroid belt.
25143 Itokawa (イトカワ,いとかわ,糸川) is a stony sub-kilometer asteroid, classified as near-Earth object of the Apollo group and potentially hazardous asteroid, that measures approximately 350 meters in diameter.
In astronomy, the 2dF Galaxy Redshift Survey (Two-degree-Field Galaxy Redshift Survey), 2dF or 2dFGRS is a redshift survey conducted by the Anglo-Australian Observatory (AAO) with the 3.9m Anglo-Australian Telescope between 1997 and 11 April 2002.
In mathematics, a 3-sphere, or glome, is a higher-dimensional analogue of a sphere.
3753 Cruithne (For instance, on the British television show Q.I. (Season 1; aired 11 Sept 2003).) is a Q-type, Aten asteroid in orbit around the Sun in 1:1 orbital resonance with Earth, making it a co-orbital object.
3C 273 is a quasar located in the constellation Virgo.
Vesta, minor-planet designation 4 Vesta, is one of the largest objects in the asteroid belt, with a mean diameter of.
The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO) is a rimless bottlenecked intermediate cartridge family developed in Belgium by FN Herstal.
50000 Quaoar, provisional designation, is a non-resonant trans-Neptunian object (cubewano) and possibly a dwarf planet in the Kuiper belt, located in the outermost region of the Solar System.
51 Pegasi (abbreviated 51 Peg), also named Helvetios, is a Sun-like star located from Earth in the constellation of Pegasus.
5535 Annefrank, provisional designation, is a stony Florian asteroid and suspected contact binary from the inner asteroid belt, approximately 4.5 kilometers in diameter.
The 6 Hours of Donington is a sports car race held at Donington Park in the United Kingdom.
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.
The 6 Hours of Silverstone (formerly the 1000 km of Silverstone) is an endurance sports car race held at Silverstone Circuit near the Northamptonshire villages of Silverstone and Whittlebury.
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.
The 7.62×51mm NATO (official NATO nomenclature 7.62 NATO) is a rimless bottlenecked rifle cartridge developed in the 1950s as a standard for small arms among NATO countries.
90377 Sedna is a large minor planet in the outer reaches of the Solar System that was,, at a distance of about 86 astronomical units (AU) from the Sun, about three times as far as Neptune.
99942 Apophis (previously known by its provisional designation) is a near-Earth asteroid that caused a brief period of concern in December 2004 because initial observations indicated a probability of up to 2.7% that it would hit Earth on April 13, 2029.
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m, 1e6 metres, 1e7 m, 1e7 metres, 1e8 m, 1e8 metres, 1e9 m, 1e9 metres, 1fm, 1hm, 1km, 1m, 1mam, 1mm, 1mom, 1mym, 1nm, 1pm, 1um, 1ym, 1zm, 1µm, 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, Exametre, Femtometers, 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, Lengths of other orders of magnitude, Megameter, Megametre, Myriameter, Myriametre, Myriamètre, Myriometer, Myriometre, 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, Order of magnitude – length, Orders of magnitude (distance), Petametre, Petametres, Relative orders of magnitude (length), 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, Terametre, Yoctometer, Yoctometre, Yottameter, Yottametre, Zeptometer, Zeptometre, Zettametre.