Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979qjras..20...97w&link_type=abstract
Royal Astronomical Society, Quarterly Journal, vol. 20, June 1979, p. 97-114.
Astronomy and Astrophysics
Astronomy
2
Cosmology, Planetary Evolution, Solar System, Deposition, Flocculating, Planetary Systems, Protoplanets
Scientific paper
After a brief examination of the historically important but long since refuted nebula theory of Laplace and the two-star interaction theories of Jeans and Jeffreys, attention is turned to four recent theories concerning the origin of planetary systems. The four theories examined individually are: (1) Cameron's solar nebula theory (1978), which suggests that the solar nebular cloud may be compressed when it moves into a spiral arm of a galaxy and that the actual process of collapse may be triggered off by a nearby supernova explosion; (2) the Schmidt-Lyttleton accretion theory which proposes that the sun, after passing through a dust cloud, acquired an envelope of gas and dust within which planets would form by accretion; (3) McCrea's floccule theory (1960) in which the process of planetary formation is directly linked to the process by which a whole cluster of stars is formed; and (4) the author's own tidal interaction capture theory (1964) wherein a passing star provides the planetary material which is captured by the sun. These theories are then compared and contrasted, and their major strengths and weaknesses are analyzed.
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