Get it on Google Play
New! Download Unionpedia on your Android™ device!
Faster access than browser!
New! Discover your interests! » Create account

A parsec (symbol: pc) is a unit of length used to measure the astronomically large distances to objects outside the Solar System. [1]

96 relations: Absolute magnitude, Andromeda Galaxy, Angular diameter, Angular distance, Approximation, Astrometry, Astronomer, Astronomer Royal, Astronomical object, Astronomical system of units, Astronomical unit, Astronomische Nachrichten, Boötes, Boötes void, Brady Haran, Carl Charlier, Celestial sphere, CfA2 Great Wall, Constellation, Cosmic background radiation, Cosmic distance ladder, Cosmology, Diameter, Earth, European Space Agency, Frank Watson Dyson, Friedrich Bessel, Full-sky Astrometric Mapping Explorer, Gaia (spacecraft), Galactic Center, Galaxy, Galaxy cluster, Galaxy filament, Galaxy group, Giga-, Globular cluster, Goddard Space Flight Center, Herbert Hall Turner, Hercules-Corona Borealis Great Wall, Hipparcos, Hubble's law, Imperial units, International Astronomical Union, International System of Units, Kilo-, Kilometre, Light-year, List of largest cosmic structures, Mega-, Messier 87, ..., Messier object, Metre, Metric system, Mile, Milky Way, Minute and second of arc, Monthly Notices of the Royal Astronomical Society, Multiplicative inverse, NASA, Observable universe, Oort cloud, Open cluster, Orders of magnitude (length), Parallax, Particle horizon, Pleiades, Proxima Centauri, Quasar, Redshift, Right triangle, RXJ1242-11, Sagittarius (constellation), Semi-major axis, Significant figures, Skinny triangle, Small-angle approximation, Solar System, Space probe, Speed of light, Spiral galaxy, Star, Subtended angle, Sun, Supercluster, Supermassive black hole, Tangent, Telescope, Trigonometric functions, Trigonometry, United States customary units, Units of measurement, University of Nottingham, Virgo Cluster, Voyager 1, 1,000,000,000, 61 Cygni. Expand index (46 more) »

Absolute magnitude is the measure of intrinsic brightness of a celestial object.

New!!: Parsec and Absolute magnitude · See more »

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.

New!!: Parsec and Andromeda Galaxy · See more »

The angular diameter or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view.

New!!: Parsec and Angular diameter · See more »

In mathematics (in particular geometry and trigonometry) and all natural sciences (including astronomy, geophysics, etc.), the angular distance (angular separation, apparent distance, or apparent separation) between two point objects, as observed from a location different from either of these objects, is the size of the angle between the two directions originating from the observer and pointing towards these two objects.

New!!: Parsec and Angular distance · See more »

An approximation is anything that is similar but not exactly equal to something else.

New!!: Parsec and Approximation · See more »

Astrometry is the branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies.

New!!: Parsec and Astrometry · See more »

An astronomer is a scientist in the field of astronomy who studies stars, planets, moons, comets, and galaxies, as well as many other celestial objects.

New!!: Parsec and Astronomer · See more »

Astronomer Royal is a senior post in the Royal Households of the United Kingdom.

New!!: Parsec and Astronomer Royal · See more »

An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that current science has demonstrated to exist in the observable universe.

New!!: Parsec and Astronomical object · See more »

The astronomical system of units, formally called the IAU (1976) System of Astronomical Constants, is a system of measurement developed for use in astronomy.

New!!: Parsec and Astronomical system of units · See more »

The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun.

New!!: Parsec and Astronomical unit · See more »

Astronomische Nachrichten (Astronomical Notes), one of the first international journals in the field of astronomy, was founded in 1821 by the German astronomer Heinrich Christian Schumacher.

New!!: Parsec and Astronomische Nachrichten · See more »

Boötes is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere.

New!!: Parsec and Boötes · See more »

The Boötes void or the Great Void is a huge and approximately spherically shaped region of space, containing very few galaxies.

New!!: Parsec and Boötes void · See more »

Brady John Haran (born 18 June 1976) is an Australian independent film-maker and video journalist who is known for his educational videos and documentary films produced for BBC News and for his YouTube channels, such as Numberphile and Periodic Videos.

New!!: Parsec and Brady Haran · See more »

Carl Vilhelm Ludwig Charlier (April 1, 1862 – November 5, 1934) was a Swedish astronomer.

New!!: Parsec and Carl Charlier · See more »

In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with Earth.

New!!: Parsec and Celestial sphere · See more »

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

New!!: Parsec and CfA2 Great Wall · See more »

In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).

New!!: Parsec and Constellation · See more »

Cosmic background radiation is electromagnetic radiation from the sky with no discernible source.

New!!: Parsec and Cosmic background radiation · See more »

The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects.

New!!: Parsec and Cosmic distance ladder · See more »

Cosmology (from the Greek κόσμος, kosmos "world" and -λογία, -logia "study of"), is the study of the origin, evolution, and eventual fate of the universe.

New!!: Parsec and Cosmology · See more »

In geometry, the diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

New!!: Parsec and Diameter · See more »

Earth (also the world, in Greek: Gaia, or in Latin: Terra), is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to accommodate life.

New!!: Parsec and Earth · See more »

The European Space Agency (ESA; Agence spatiale européenne, ASE; Europäische Weltraumorganisation) is an intergovernmental organisation dedicated to the exploration of space, with 22 member states.

New!!: Parsec and European Space Agency · See more »

Sir Frank Watson Dyson, KBE, FRS (8 January 1868 – 25 May 1939) was an English astronomer and Astronomer Royal who is remembered today largely for introducing time signals ("pips") from Greenwich, England, and for the role he played in proving Einstein's theory of general relativity.

New!!: Parsec and Frank Watson Dyson · See more »

Friedrich Wilhelm Bessel (22 July 1784 – 17 March 1846) was a German astronomer, mathematician, physicist and geodesist.

New!!: Parsec and Friedrich Bessel · See more »

Full-sky Astrometric Mapping Explorer (or FAME) was a proposed astrometric satellite designed to determine with unprecedented accuracy the positions, distances, and motions of 40 million stars within our galactic neighborhood (distances by stellar parallax possible).

New!!: Parsec and Full-sky Astrometric Mapping Explorer · See more »

Gaia is a space observatory of the European Space Agency (ESA) designed for astrometry.

New!!: Parsec and Gaia (spacecraft) · See more »

The Galactic Center is the rotational center of the Milky Way.

New!!: Parsec and Galactic Center · See more »

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

New!!: Parsec and Galaxy · See more »

A galaxy cluster or cluster of galaxies is a structure that consists of anywhere from hundreds to thousands of galaxies bound together by gravity.

New!!: Parsec and Galaxy cluster · See more »

The distribution reveals fine, filamentary structures.

New!!: Parsec and Galaxy filament · See more »

A galaxy group or group of galaxies (GrG) is an aggregation of galaxies comprising about 50 or fewer gravitationally bound members, each at least as luminous as the Milky Way (about 1010 times the luminosity of the Sun); collections of galaxies larger than groups that are first-order clustering are called galaxy clusters.

New!!: Parsec and Galaxy group · See more »

Giga is a unit prefix in the metric system denoting a factor of a (short-form) billion (109 or 000).

New!!: Parsec and Giga- · See more »

A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.

New!!: Parsec and Globular cluster · See more »

The Goddard Space Flight Center (GSFC) is a major NASA space research laboratory established on May 1, 1959 as NASA's first space flight center.

New!!: Parsec and Goddard Space Flight Center · See more »

Herbert Hall Turner FRS (13 August 1861, Leeds – 20 August 1930, Stockholm) was a British astronomer and seismologist.

New!!: Parsec and Herbert Hall Turner · See more »

Hercules-Corona Borealis Great Wall or the Great GRB Wall.

New!!: Parsec and Hercules-Corona Borealis Great Wall · See more »

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

New!!: Parsec and Hipparcos · See more »

Hubble's law is the name for the observation in physical cosmology that.

New!!: Parsec and Hubble's law · See more »

The system of imperial units or the imperial system (also known as British Imperial) is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced.

New!!: Parsec and Imperial units · See more »

The International Astronomical Union (IAU; Union astronomique internationale, UAI) is a collection of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.

New!!: Parsec and International Astronomical Union · See more »

The International System of Units (Système International d'Unités, SI) is the modern form of the metric system, and is the most widely used system of measurement.

New!!: Parsec and International System of Units · See more »

Kilo (from the Greek χίλιοι, literally a thousand) is a unit prefix in the metric system denoting multiplication by one thousand.

New!!: Parsec and Kilo- · See more »

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 United Kingdom where the statute mile is the official unit used.

New!!: Parsec and Kilometre · See more »

A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.

New!!: Parsec and Light-year · See more »

This is a list of the largest known large-scale cosmic structures.

New!!: Parsec and List of largest cosmic structures · See more »

Mega is a unit prefix in the metric system denoting a factor of one million (106 or 000).

New!!: Parsec and Mega- · See more »

Messier 87 (also known as Virgo A or NGC 4486, and generally abbreviated to M87) is a supergiant elliptical galaxy in the constellation Virgo.

New!!: Parsec and Messier 87 · See more »

The Messier objects are a set of over 100 astronomical objects first listed by French astronomer Charles Messier in 1771.

New!!: Parsec and Messier object · See more »

The metre, American spelling meter, (from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI).

New!!: Parsec and Metre · See more »

The metric system is an internationally agreed decimal system of measurement.

New!!: Parsec and Metric system · See more »

The mile is an English unit of length equal to and standardised as exactly 1.609344 kilometres by international agreement in 1959.

New!!: Parsec and Mile · See more »

The Milky Way is the galaxy that contains our Solar System.

New!!: Parsec and Milky Way · See more »

A minute of arc (MOA), arcminute (arcmin) or minute arc is a unit of angular measurement equal to one-sixtieth of one degree.

New!!: Parsec and Minute and second of arc · See more »

Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.

New!!: Parsec and Monthly Notices of the Royal Astronomical Society · See more »

In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1/x or x−1, is a number which when multiplied by x yields the multiplicative identity, 1.

New!!: Parsec and Multiplicative inverse · See more »

The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research.

New!!: Parsec and NASA · See more »

The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth at the present time because light and other signals from these objects has had time to reach the Earth since the beginning of the cosmological expansion.

New!!: Parsec and Observable universe · See more »

The Oort cloud or Öpik–Oort cloud, named after Dutch astronomer Jan Oort and Estonian astronomer Ernst Öpik, is a theoretical spherical cloud of predominantly icy planetesimals believed to surround the Sun at a distance of up to around.

New!!: Parsec and Oort cloud · See more »

An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.

New!!: Parsec and Open cluster · See more »

The following are examples of orders of magnitude for different lengths.

New!!: Parsec and Orders of magnitude (length) · See more »

Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

New!!: Parsec and Parallax · See more »

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

New!!: Parsec and Particle horizon · See more »

In astronomy, the Pleiades, or Seven Sisters (Messier 45 or M45), is an open star cluster containing middle-aged hot B-type stars located in the constellation of Taurus.

New!!: Parsec and Pleiades · See more »

No description.

New!!: Parsec and Proxima Centauri · See more »

Quasars or quasi-stellar radio sources are the most energetic and distant members of a class of objects called active galactic nuclei (AGN).

New!!: Parsec and Quasar · See more »

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.

New!!: Parsec and Redshift · See more »

A right triangle (American English) or right-angled triangle (British English) is a triangle in which one angle is a right angle (that is, a 90-degree angle).

New!!: Parsec and Right triangle · See more »

RXJ1242-11 is an elliptical galaxy located approximately 200 megaparsecs (about 650 million light-years) from Earth.

New!!: Parsec and RXJ1242-11 · See more »

Sagittarius is one of the constellations of the zodiac.

New!!: Parsec and Sagittarius (constellation) · See more »

In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the widest points of the perimeter.

New!!: Parsec and Semi-major axis · See more »

The significant figures of a number are digits that carry meaning contributing to its measurement resolution.

New!!: Parsec and Significant figures · See more »

A skinny triangle in trigonometry is a triangle whose height is much greater than its base.

New!!: Parsec and Skinny triangle · See more »

The small-angle approximation is a useful simplification of the basic trigonometric functions which is approximately true in the limit where the angle approaches zero.

New!!: Parsec and Small-angle approximation · See more »

The Solar SystemCapitalization of the name varies.

New!!: Parsec and Solar System · See more »

A space probe is a robotic spacecraft that leaves Earth orbit and explores space.

New!!: Parsec and Space probe · See more »

The speed of light in vacuum, commonly denoted, is a universal physical constant important in many areas of physics.

New!!: Parsec and Speed of light · See more »

A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, forms part of the Hubble sequence.

New!!: Parsec and Spiral galaxy · See more »

A star is a luminous sphere of plasma held together by its own gravity.

New!!: Parsec and Star · See more »

In geometry, an angle subtended by an arc, line, or other curve is one whose two rays pass through the endpoints of the arc.

New!!: Parsec and Subtended angle · See more »

The Sun (in Greek: Helios, in Latin: Sol) is the star at the center of the Solar System and is by far the most important source of energy for life on Earth.

New!!: Parsec and Sun · See more »

Superclusters are large groups of smaller galaxy clusters or galaxy groups and are among the largest known structures of the cosmos.

New!!: Parsec and Supercluster · See more »

A supermassive black hole (SMBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses, and is found in the center of almost all massive galaxies.

New!!: Parsec and Supermassive black hole · See more »

In geometry, the tangent line (or simply tangent) to a plane curve at a given point is the straight line that "just touches" the curve at that point.

New!!: Parsec and Tangent · See more »

A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).

New!!: Parsec and Telescope · See more »

In mathematics, the trigonometric functions (also called the circular functions) are functions of an angle.

New!!: Parsec and Trigonometric functions · See more »

Trigonometry (from Greek trigōnon, "triangle" and metron, "measure") is a branch of mathematics that studies relationships involving lengths and angles of triangles.

New!!: Parsec and Trigonometry · See more »

United States customary units are a system of measurements commonly used in the United States.

New!!: Parsec and United States customary units · See more »

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

New!!: Parsec and Units of measurement · See more »

The University of Nottingham is a public research university based in Nottingham, Nottinghamshire, England, United Kingdom.

New!!: Parsec and University of Nottingham · See more »

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

New!!: Parsec and Virgo Cluster · See more »

Voyager 1 is a space probe launched by NASA on September 5, 1977.

New!!: Parsec and Voyager 1 · See more »

1,000,000,000 (one billion, short scale; one thousand million or milliard, yard, long scale) is the natural number following 999,999,999 and preceding 1,000,000,001.

New!!: Parsec and 1,000,000,000 · See more »

61 Cygni Not to be confused with 16 Cygni, a more distant system containing two G-type stars harboring the gas giant planet 16 Cygni Bb.

New!!: Parsec and 61 Cygni · See more »

Redirects here:

Gigaparsec, Kiloparsec, Kiloparsecs, Megaparsec, Megaparsecs, Microparsec, Milliparsec, Parallax of one arc second, Parallax second, Parsecs, Secpar, .


[1] https://en.wikipedia.org/wiki/Parsec

Hey! We are on Facebook now! »