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Satellite-Sized Planetesimals and Lunar Origin by HARTMANN, William K. & DAVIS, Donald R
Book Description
New York: Academic Press, 1975. First edition of this modern classic in the field on selenology. Pp. 504-515. Four issues, all with front wrappers present. Orange buckram with black spine lettering. California Institute of Technology copy with their 'Withdrawn' slip on front endpaper. Fresh and clean. The prevailing hypothesis today is that the EarthÐMoon system formed as a result of a giant impact. A Mars-sized body (labelled "Theia") is believed to have hit the proto-Earth, blasting sufficient material into orbit around the proto-Earth to form the Moon through accretion. As accretion is the process by which all planetary bodies are believed to have formed, giant impacts are thought to have affected most if not all planets. Computer simulations modelling a giant impact are consistent with measurements of the angular momentum of the EarthÐMoon system, as well as the small size of the lunar core.The paper here presented was the fist time this new generally upheld idea was put forth in print. Unresolved questions regarding this theory concern the determination of the relative sizes of the proto-Earth and Theia and of how much material from these two bodies formed the Moon.
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