Astronomy Cast Ep. 17: Where Does the Moon Come From?

http://www.astronomycast.com/archive/

From January 1, 2007.

We take the Moon for granted, but its effect on the Earth is very important; possibly even critical for the formation of life. But where did it come from? Did the Earth and Moon form together? Or did the Earth capture a wayward Moon? Or was there a more catastrophic cause to this lunar mystery?

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