There is a hypothesis that says a part of the Earth was split away and became the Moon. Is there any scientific evidence for this claim?
There is quite a bit. Here are the ones that come to mind immediately:
The fission hypothesis does not really explain why the moon rotates at the same rate as it's orbit of the Earth. The scenario of a external force like another planet or giant comet hiting the Earth and braking off a piece that created the moon would better explain the velocities of rotation. As they say the second hypothesis is not ruled out, but the first just makes better sense when you study the rate of velocity of its orbit around us and the rotation on its axis.
protected by Qmechanic♦ Apr 21 '14 at 18:14
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