Computer Science
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sci...217..891b&link_type=abstract
Science, vol. 217, Sept. 3, 1982, p. 891-898. Research supported by the Alfred P. Sloan Foundation.
Computer Science
3
Earth-Moon System, Lunar Composition, Lunar Evolution, Planetary Evolution, Abundance, Capture Effect, Iron, Lunar Core, Nickel
Scientific paper
A developmental history is presented for the lunar formation thesis of Harold C. Urey (1893-1981), which envisions that the moon was captured by the earth and that it has remained essentially unchanged until the present. Attention is given to the competing theories, of binary planet formation and lunar fission from the primordial earth. The fission theory suggests that the deficiency of such siderophile elements as nickel in the lunar crust implied extraction by liquid iron, which must have been left behind, on earth. Urey abandoned the capture hypothesis as a result of collaboration with J. A. O'Keefe (after 1969) on the fission theory. The earlier contention of Urey that the moon was already cold at the moment of earth capture, and therefore preserved a record of the earliest days of the solar system, prompted NASA to give high priority to lunar exploration. Support has been adduced for the fission theory on the basis of Apollo data.
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