Astronomy Beta

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 Nice Question
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earned this badge 2 times.
Is the moon “perfectly” tidally locked and, if not, how long would it take us to observe it's rotation?
Awarded Sep 4 '19 at 12:15
If we found evidence of life on Mars, how would we know that it originated on Mars rather than Earth?
Awarded Jan 13 '17 at 16:33

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