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- Parsec abstract "A parsec (symbol: pc) is a unit of length used to measure the astronomically large distances to objects outside the Solar System. One parsec is the distance at which one astronomical unit subtends an angle of one arcsecond. A parsec is equal to about 3.26 light-years (31 trillion kilometres or 19 trillion miles) in length. The nearest star, Proxima Centauri, is about 1.3 parsecs from the Sun. Most of the stars visible to the unaided eye in the nighttime sky are within 500 parsecs of the Sun.The parsec unit was likely first suggested in 1913 by British astronomer Herbert Hall Turner. Named from an abbreviation of the parallax of one arcsecond, it was defined so as to make calculations of astronomical distances quick and easy for astronomers from only their raw observational data. Partly for this reason, it is still the unit preferred in astronomy and astrophysics, though the light year remains prominent in popular science texts and everyday usage. Although parsecs are used for the shorter distances within the Milky Way, multiples of parsecs are required for the larger scales in the universe, including kiloparsecs for the more distant objects within and around the Milky Way, megaparsecs for all but the closest galaxies, and gigaparsecs for many quasars and the most distant galaxies.In August 2015, the IAU passed Resolution B2, which as part of the definition of a standardizedabsolute and apparent bolometric magnitude scale, included an explicit definition of the parsec as exactly 7005648000000000000♠648000⁄π astronomical units, or approximately 7016308567758100000♠3.085677581×1016 metres (based on the IAU 2012 exact SI definition of the astronomical unit). This corresponds to the small-angledefinition of the parsec found in many contemporary astronomical references.".
- Parsec thumbnail Stellarparallax_parsec1.svg?width=300.
- Parsec wikiPageExternalLink distances.html.
- Parsec wikiPageID "23335".
- Parsec wikiPageLength "20911".
- Parsec wikiPageOutDegree "139".
- Parsec wikiPageRevisionID "678569851".
- Parsec wikiPageWikiLink 1,000,000,000.
- Parsec wikiPageWikiLink 1000000000_(number).
- Parsec wikiPageWikiLink 61_Cygni.
- Parsec wikiPageWikiLink Absolute_magnitude.
- Parsec wikiPageWikiLink Adjacent_side_(right_triangle).
- Parsec wikiPageWikiLink Andromeda_Galaxy.
- Parsec wikiPageWikiLink Angular_diameter.
- Parsec wikiPageWikiLink Angular_distance.
- Parsec wikiPageWikiLink Approximation.
- Parsec wikiPageWikiLink Arcsecond.
- Parsec wikiPageWikiLink Astrometry.
- Parsec wikiPageWikiLink Astronomer.
- Parsec wikiPageWikiLink Astronomer_Royal.
- Parsec wikiPageWikiLink Astronomical_object.
- Parsec wikiPageWikiLink Astronomical_system_of_units.
- Parsec wikiPageWikiLink Astronomical_unit.
- Parsec wikiPageWikiLink Astronomical_units.
- Parsec wikiPageWikiLink Astronomical_units_of_length.
- Parsec wikiPageWikiLink Bolometric_magnitude.
- Parsec wikiPageWikiLink Bootes_(constellation).
- Parsec wikiPageWikiLink Bootes_void.
- Parsec wikiPageWikiLink Boötes.
- Parsec wikiPageWikiLink Boötes_void.
- Parsec wikiPageWikiLink Brady_Haran.
- Parsec wikiPageWikiLink Carl_Charlier.
- Parsec wikiPageWikiLink Category:Parallax.
- Parsec wikiPageWikiLink Category:Units_of_length.
- Parsec wikiPageWikiLink Category:Units_of_measurement_in_astronomy.
- Parsec wikiPageWikiLink Celestial_sphere.
- Parsec wikiPageWikiLink CfA2_Great_Wall.
- Parsec wikiPageWikiLink Constellation.
- Parsec wikiPageWikiLink Cosmic_background_radiation.
- Parsec wikiPageWikiLink Cosmic_distance_ladder.
- Parsec wikiPageWikiLink Cosmological_horizon.
- Parsec wikiPageWikiLink Cosmology.
- Parsec wikiPageWikiLink Diameter.
- Parsec wikiPageWikiLink Earth.
- Parsec wikiPageWikiLink European_Space_Agency.
- Parsec wikiPageWikiLink Frank_Watson_Dyson.
- Parsec wikiPageWikiLink Friedrich_Bessel.
- Parsec wikiPageWikiLink Friedrich_Wilhelm_Bessel.
- Parsec wikiPageWikiLink Gaia_(spacecraft).
- Parsec wikiPageWikiLink Gaia_mission.
- Parsec wikiPageWikiLink Galactic_Center.
- Parsec wikiPageWikiLink Galaxy.
- Parsec wikiPageWikiLink Galaxy_cluster.
- Parsec wikiPageWikiLink Galaxy_filament.
- Parsec wikiPageWikiLink Galaxy_group.
- Parsec wikiPageWikiLink Giga-.
- Parsec wikiPageWikiLink Globular_cluster.
- Parsec wikiPageWikiLink Herbert_Hall_Turner.
- Parsec wikiPageWikiLink Hercules-Corona_Borealis_Great_Wall.
- Parsec wikiPageWikiLink Hercules–Corona_Borealis_Great_Wall.
- Parsec wikiPageWikiLink Hipparcos.
- Parsec wikiPageWikiLink Hubble_constant.
- Parsec wikiPageWikiLink Hubbles_law.
- Parsec wikiPageWikiLink IAU.
- Parsec wikiPageWikiLink Imperial_units.
- Parsec wikiPageWikiLink International_Astronomical_Union.
- Parsec wikiPageWikiLink International_System_of_Units.
- Parsec wikiPageWikiLink Kilo-.
- Parsec wikiPageWikiLink Kilometre.
- Parsec wikiPageWikiLink Large-scale_structure_of_the_cosmos.
- Parsec wikiPageWikiLink Light-year.
- Parsec wikiPageWikiLink Light_year.
- Parsec wikiPageWikiLink List_of_largest_cosmic_structures.
- Parsec wikiPageWikiLink List_of_largest_known_cosmic_structures.
- Parsec wikiPageWikiLink Mega-.
- Parsec wikiPageWikiLink Messier_object.
- Parsec wikiPageWikiLink Metre.
- Parsec wikiPageWikiLink Metric_system.
- Parsec wikiPageWikiLink Mile.
- Parsec wikiPageWikiLink Milky_Way.
- Parsec wikiPageWikiLink Minute_and_second_of_arc.
- Parsec wikiPageWikiLink Minute_of_arc.
- Parsec wikiPageWikiLink Multiplicative_inverse.
- Parsec wikiPageWikiLink Observable_universe.
- Parsec wikiPageWikiLink Oort_cloud.
- Parsec wikiPageWikiLink Open_cluster.
- Parsec wikiPageWikiLink Orders_of_magnitude_(length).
- Parsec wikiPageWikiLink Orders_of_magnitude_(numbers).
- Parsec wikiPageWikiLink Parallax.
- Parsec wikiPageWikiLink Particle_horizon.
- Parsec wikiPageWikiLink Pleiades.
- Parsec wikiPageWikiLink Proxima_Centauri.
- Parsec wikiPageWikiLink Quasar.
- Parsec wikiPageWikiLink RXJ1242-11.
- Parsec wikiPageWikiLink Redshift.
- Parsec wikiPageWikiLink Right_triangle.
- Parsec wikiPageWikiLink SI.
- Parsec wikiPageWikiLink Sagittarius_(constellation).
- Parsec wikiPageWikiLink Semi-major_axis.
- Parsec wikiPageWikiLink Semimajor_axis.