This video is a short documentary on the Collisional Ejection Theory for the creating on the Earth’s moon. It features Bill Hartmann and Robin Canup who were important figures in the development of this theory.
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That is kind of a complex question. In the simplest form, of course, the moon revolves around the Earth. The larger Earth exerts a considerable gravitational force on the smaller moon which keeps the moon is a regular orbit. The moon also exerts a weaker gravitational force on the Earth. This gravitational force has strong effects on such Earth effects as the tides of major bodies of water and the weather to a lesser degree. The moon, of course, provides light to the Earth during Earth nights depending upon its position in the Earth’s sky, by reflecting sunlight. Was this answer helpful?