Parsec

stellar parallax motion from annual parallax

The jet erupting from the active galactic nucleus of M87 is thought to be 7000150000000000000♠1.5 kiloparsecs (7019462629720109201♠4890 ly) long. (image from Hubble Space Telescope)

A parsec (symbol: pc) is a unit of length used to measure 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 (4.24 light-years) from the Sun. Most of the stars visible to the unaided eye in the nighttime sky are within 500 parsecs of the Sun.

单词	Parallax second
释义	Parallax second 英语百科 Parsec A parsec (symbol: pc) is a unit of length used to measure 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 (4.24 light-years) from the Sun. Most of the stars visible to the unaided eye in the nighttime sky are within 500 parsecs of the Sun.
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Parallax second

Parsec