Physics
‘Parsec’ is the unit measurement of
Density of stars
Astronomical distance
Brightness of heavenly bodies
Orbital velocity of giant stars
Astronomical distance
One parsec is the distance to an object whose parallax angle is one arcsecond. The radius of the Earth’s orbit equals one astronomical unit (AU), so an object that is one parsec distant is 206,265 AU (or 3.26 light-years) away.
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