![]() The Sun is at a distance of 8.3 kiloparsecs from the centre of the Milky Way system. ![]() One parsec corresponds to the distance at which the mean radius of the earths orbit subtends an angle of one second of arc. In the Milky Way Galaxy, wherein Earth is located, distances to remote stars are measured in terms of kiloparsecs (1 kiloparsec 1,000 parsecs). a unit of distance used in astronomy, equal to about 3.25 light years (3.08 × 1016 meters). Partly for this reason, it is the unit preferred in astronomy and astrophysics, though the light-year remains prominent in popular science texts and common usage.Īlthough 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 (kpc) for the more distant objects within and around the Milky Way, megaparsecs (Mpc) for mid-distance galaxies, and gigaparsecs (Gpc) for many quasars and the most distant galaxies. One parsec equals 3.26 light-years, which is equivalent to 3.09 × 10 13 km (1.92 × 10 13 miles). Named as a portmanteau of the parallax of one arcsecond, it was defined to make calculations of astronomical distances from only their raw observational data quick and easy for astronomers. prsc key parallax + second, in astronomy, basic unit of length for measuring interstellar and intergalactic distances, equal to 206265 times the. It stands for 'parallax of one arc second', and is approximately 19,131,554,073,600 (19 trillion) miles. The parsec unit was probably first suggested in 1913 by the British astronomer Herbert Hall Turner. The parsec (symbol pc) is a unit of length used in astronomy. A parsec is obtained by the use of parallax and trigonometry, and is defined as the distance at which one astronomical unit subtends an angle of one arcsecond, ie. The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System. One parsec equals 3.26 light-years, which is equivalent to 3.09 × 10 13 km (1.92 × 10 13 miles). ![]()
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