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Old August 20 2009, 03:22 PM   #3
trekkiedane
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Re: Io transit on Ganymede - Cool images!

Ganymede is the largest moon in the entire Sol system, it has a mean radius of 2634.1 0.3 km (0.413 Earths) Io has a mean radius of 1,821.3 km (0.286 Earths) (Wikipedia)
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