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| A parsec corresponds to exactly 648,000/ astronomical units (AU; the average Earth- Sun distance). |
A UNIT OF DISTANCE. Ignore Han Solo’s Kessel run.
A parsec is an astronomical unit of distance based on
geometry. Also equal to 3.26 light-years, it represents how
far away an observer would be to observe the Earth and
Sun separated by 1 arcsecond on the sky. By flipping the
system around, astronomers can measure distances to
stars by parallax, or how much they appear to move as the
Earth travels around the Sun
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