作者: H. J. Melosh
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摘要: The putative giant collision between the proto-Earth and a protoplanet half its diameter that created the Moon 4500 my ago would have had a profound effect on the thermal state of the early Earth. Recent work on the size-frequency distribution of the planetesimal swarm indicates that most of the mass and energy of the swarm resides in objects at the large end of the spectrum, so that most of the Earth's growth may have occurred in catastrophic impacts with bodies up to half its own diameter. In such collisions heat is deposited deep …