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Moon could have formed from Earth after all:
Reviving and revising the giant impact theory


from Earth Magazine

Scientists are revisiting the age-old question of how Earth's moon formed. New models indicate that it could have been born from the Earth following a giant collision after all. The idea of a moon-forming collision is not new. The giant impact theory — the idea that a catastrophic collision about 4.5 billion years ago between Earth and a protoplanet about half Earth's size created a disk of molten rock, gas and debris that consolidated to form the moon — was first set forth in the mid-1970s. more


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