A unit of distance used in astronomy, equal to about 3.26 light years (3.086 × 1013 kilometres). One parsec corresponds to the distance at which the mean radius of the earth’s orbit subtends an angle of one second of arc.
- But cosmologists are so comfortable with millions and billions that none of them feel the urge to invent a unit much beyond the light-year or the parsec.
- I mean, all the ones that I've looked at so far are within 100 parsecs of 300 light years of the Sun.
- For reference, one parsec is around three light years.
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