Other units used in Astronomy
Astronomical Unit (AU) = distance from Earth to the Sun
= 1.5x1011 m
Light Year (ly) = distance light travels in one year =
d = v t = 3.0x108 m/s x 3.16x107 s =
9.5x1015 m
Parsec (pc) = 206264.81 AU = 3.26 ly
= 3.1x1016 m
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