Parsec



A parsec (symbol: pc) is a unit of length used to measure large distances to objects outside our Solar System. One parsec is the distance at which one astronomical unit subtends an angle of one arcsecond.[1] 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 (4.25 light-years) from the Sun.[2] Most of the stars visible to the unaided eye in the nighttime sky are within 500 parsecs of the Sun.

https://en.wikipedia.org/wiki/Parsec 

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