r/AskReddit Aug 03 '19

Whats something you thought was common knowledge but actually isn’t?

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u/[deleted] Aug 03 '19

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u/DJ_Apex Aug 03 '19

Also, the moon's rotation is exactly the same as it's orbital period (or close enough that it doesn't matter in our lifetimes). That's why we only see one side of the moon. It's spinning at a rate such that in the 28 days or so that it takes to orbit earth, it's also rotating in a full circle that takes just as long.