How does the moon, based on it's size and weight, orbit the Earth when the Earth has relatively weak gravity?

How does the moon, based on it's size and weight, orbit the Earth when the Earth has relatively weak gravity?
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Answer :

The moon is in the exact right area to be captured by the Earths gravity. Not to close and not to far. Well it actualy IS a little too close. The moon is in a slightly degrading orbit. It should hit the Earth in about another 100 billion years. I’m personaly a fan of the theory that the moon was a slow moving asteroid that we captured in our gravity well. That would explain it’s orbit because something that is ejected from the Earth doesn’t establish orbit by itself. It needs an outside force.
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