Computer Science
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12....3k&link_type=abstract
(Planetary studies; Proceedings of Symposium 4 and the Topical Meeting of the Interdisciplinary Scientific Commission B /Meeting
Computer Science
Neptune (Planet), Planetary Evolution, Solar System Evolution, Gas Giant Planets, Protoplanets
Scientific paper
The mean densities and atmospheric compositions of Neptune and Uranus indicate that they were accreted from planetesimals after much of the gaseous nebula had been lost, but not all. The heat flows, radial structure, and rotations of Neptune and Uranus indicate that the planetesimals were rather massive. The impacting planetesimals were a minor portion of the population, most of it having been ejected by encounters with the planets, mainly Jupiter. The mass of the population must have been many times that estimated for the comets: 10-100 earth masses in the Oort cloud plus the Kuiper Belt. Hence, Neptune and Uranus may have migrated appreciably in the formation process, and the wide spacing of the major planets may arise largely from the shifting of resonance effects with the loss of planetesimal mass.
Kaula William M.
Newman William I.
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