Astronomy - Units of Measurement
Astronomical Unit (AU) = 1.5E+8 km. This is the average distance between the center of the Sun and the center of the Earth.
Light Year (LY) = 9.46E+12 km. This is the distance travelled by light in one year. Light travels at 3E+8 m/s.
Parsec (PC) = 3.09E+13 km. 1 PC = 3.26 LY
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