I may post more about this. I saw a documentary discussing this years ago but something else I heard recently that was related to this caught my attention and I can’t find it to share, but I will when I find it again.
Most researchers think that the Moon formed in the very early days of the Solar System, 4.5 billion years ago, when a large protoplanet smashed into the embryonic Earth. Debris from the collision mingled together and then settled into orbit around Earth, where it coalesced into the Moon.
http://www.scientificamerican.com/article/lunar-rock-chemistry-argued-to-reveal-how-the-moon-formed/
Another interesting article on the topic
The giant impact hypothesis, sometimes called the Big Splash, states that the Moon was formed out of the debris left over from an indirect collision between the Earth and an astronomical body the size of Mars, approximately 4.5 billion years ago, in the Hadean eon.
http://www.bbc.co.uk/science/earth/earth_timeline/moon_formed
6.22.14 Update
I found what caught my attention. Apparently Zecharia Sitchin proposed the Moon Impact Theory before it was widely accepted
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