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originally posted by: eriktheawful
a reply to: wayforward
The Earth's mass and gravitational field is wrong for capturing a object the size and mass of the Moon.
The Moon is slowly moving away from the Earth. (at a small amount per year)
The Earth's spin is slowing down (at a small rate)
If you wind the clock back, you'll find a moon that is very close to the Earth, and the Earth is spinning very, very fast: the result of a major impact.
What follows is a Moon created out of the debris of that impact, and then between the Earth and the Moon, slowly braking the Earth's spin to what it is today.
As mentioned in another post: it also is what caused the moon to be tidally in phase with it's spin on it's axis and it's orbit around the Earth (and why one side always faces us).
We also have fossil evidence of tides on Earth generated by the Moon going back millions of years.