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PHYS 162 Elementary Astronomy - page 10 / 29

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PHYS 162 Class 1

PHYS 162 Class 1

Units and Powers of 10

we won’t use much “math” and you don’t have to remember these values, just don’t get lost. Use AU and LY for most distances

Solar radius = 700,000 km = 7 x 105 km

Distance Earth-Sun = 1 Astronomical Unit (AU) =          150,000,000 km = 1.5x108 km    (= 8 light-minutes)

Distance to the closest star = 4 x 1013 km = 4 Light Years = 4 LY

 1 LY = distance that light travels in one year

          = velocity x time

          = 3 x 105 km/sec x 3.12 x 107 sec/year

          = 1013 km

1 parsec = 3.3 LY

USE

AU and LY

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