Earth's Moon is the only moon that has a theory it came to be by coming out of the Earth. That is crazy Capture fits #1 Moon has no atmosphere #2 Moon has no water.#3 Moon has very little iron #4 Moon is like an asteroid being its a sand pit and covered with craters upon crates,and its worse on its farside. I have always gone with the thinking Earth and Moon comprise a binary planet system. TreBert