Parsec can refer to a couple of different concepts depending on the context: 1. **Astronomy**: In astronomy, a parsec (pc) is a unit of distance used to measure astronomical distances. It is defined as the distance at which one astronomical unit (the average distance from the Earth to the Sun) subtends an angle of one arcsecond. One parsec is equivalent to approximately 3.26 light-years, or about 30.9 trillion kilometers (19.
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