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Elliott Diedrich's avatar

There is a zero chance that the moon was captured by the earth's gravitational field as it has remained in orbit around the earth since its known existence without the slightest spin. While in the vacuum of space, every object will retain its momentum including its spin unless a force acts against it. For the moon to be orbiting around the earth in perfect synchronization so that only one side is ever visible from the earth, must have been done on purpose.

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Brian C's avatar

The Earth's density is 5.5 g/cc whereas the Moon's is 3.3 g/cc, so the Moon could be up to 40% hollow. It is also possible that as the Earth formed the heavier elements formed the Earth, and the Moon, being further away from the centre of gravity, gathered generally lighter elements.

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