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The moon’s stable orbit

It is my understanding that the gravitational attraction between the earth and the moon more or less exactly equals the moon’s inertia. (The so called centrifugal force caused by the moon attempting to travel in a straight line, tangent to it’s orbit).

Considering the Conservation of Energy, and the many asteroids/meteorites that have impacted both the earth and the moon over millennia, how is it that the moon has neither plummeted to earth or spun off elsewhere?

I would have thought that the energy transferred to the moon via the collision of a speeding astroid or meteorite, would have impacted on the moon’s total mass, and in doing so would have disrupted the very delicate balance that currently exists.

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