The differences suggest that Earth and Moon came into being far from each other, an idea that stumbles over the inability of astrophysicists to explain how exactly the Moon became a satellite of the Earth." The Moon is extremely dry and does not appear to have ever had water in any substantial amounts. None of the Moon rocks, regardless of where they were found, contained free water or even water molecules bound into the minerals. Yet Apollo 16 astronauts found Moon rocks that contained bits of rusted iron. Since oxidation requires