Geologic Fact Two:

Early in Earth's history, a young planet, Theia, crashed into us. Had it been a head-on collision, both planets would've been destroyed. Instead, pieces of Earth and Theia's remains blasted into space. Thanks to gravity, it eventually pulled the rubble together, creating a ring of dust and debris. From this ring, our Moon formed.

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Because it was so close to Earth at first and because of Theia's impact, days only lasted six hours. Over time, though, the Moon moved away, and days became longer.