Posted by ned on Sunday, November 1, 2009 at 4:47pm.
It is mostly speculation. The idea is that a space object, large, with an iron core, hit early Earth, easily penetrating Earth's crust. Most of the core material joined with Earth's core, however, the impact thru off a considerable amount of mantle material, and some magma, which formed the moon. The loss of the iron core made the new Moon with a small core.
there are a lot of problems still with this theory.
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