10 surprising lunar facts

POSTED: 9:43 AM Jul 11 2014   UPDATED: 6:50 AM Sep 08 2014

Sky watchers can expect to see a Harvest Moon Monday night, which will also be the last of this summer's three supermoons. Check out 10 surprising facts about Earth's closest neighbor.

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Origins -- According to the leading theory, the moon was created when a rock the size of Mars slammed into Earth about 4.5 billion years ago.