In my reading about Astronomy, I have encountered two seemingly different scenarios for the origin of the Moon: (A) Planet Gaia (unsure of spelling) crashed into the Earth. It nearly destroyed the Earth, but from that collision, debris formed into the Moon. (B) Planet Orpheus crashed into the Earth at a very oblique angle, so oblique, that there were two collisions. Debris blew off and for reasons having to do with the Roche radius, debris formed into the Moon. How can there be two different planets that theoretically crashed into the Earth? That can't possibly be right. Why exactly does the Moon move 1/2 an inch further away every year from the Earth? Do other moons do this, in particular, my username? This seems really weird.