Scientists explain key issue in how moon developed

April 9, 2015 1:43 PM

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Scientists explain key issue in how moon developed

Buzz Aldrin Jr. posing for a photograph beside the US flag deployed on the moon during the Apollo 11 mission in 1969. (AP Photo/NASA/Neil A. Armstrong, File)

How did our moon come to be? The dominant theory holds that it broke off of the Earth when another planet collided with ours, about 4.5 billion years ago.

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