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By dgingeri on 1/18/2011 4:13:47 PM , Rating: 2
a while back, I saw a show on History that detailed what they think happened when the moon formed. They showed computer modeling that had a smaller earth and a larger planet collide, the heavier elements, including the iron cores, settle to the center of the new Earth and the lighter elements settle on what became the moon. There could be a lot to the theory of elements rare here that would be plentiful on the moon.

We know that Iridium is even more rare on the earth than in space, and with the whole solar system made from the same dust cloud, there should be pretty much equal distributions of iridium throughout the inner solar system. so the iridium must have ended up on the moon after the collision. There's likely to be more elements like that. The moon could be a huge cash cow.

