Physics – Space Physics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983rvgsp..21..206w&link_type=abstract
(International Union of Geodesy and Geophysics, General Assembly, 18th, Hamburg, West Germany, Aug. 15-27, 1983) Reviews of Geop
Physics
Space Physics
3
Planetary Evolution, Solar System, Stellar Evolution, Chemical Composition, Gas Giant Planets, Natural Satellites, Planetary Nebulae, Protoplanets, Solar Corona, Terrestrial Planets
Scientific paper
In recent years, considerable progress has been made toward understanding the origin of the solar system. There exists a broad consensus that the planets are derived from a nebular disk which formed with the sun itself. There are, however, disagreements regarding the assumed mass of the solar nebula. Estimates range from a few percent of the sun's mass, the minimum required to make the planets, up to one solar mass. The two extremes lead to very different models of planet formation. The general problem of star formation is considered, taking into account the production of a circumsolar disk nebula due to angular momentum in the protostellar cloud. Collapse of a rotating cloud is modeled by computer codes. Attention is given to the chemical evidence concerning the solar nebula, relations regarding planetesimals and terrestrial planets, and protoplanets and giant planets.
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