Physics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998lpico.957...17k&link_type=abstract
Origin of the Earth and Moon, Proceedings of the Conference held 1-3 December, 1998 in Monterey, California. LPI Contribution N
Physics
Gravitational Effects, Planetary Evolution, Protoplanets, Solar System, Terrestrial Planets, Models, Planetary Orbits, Jupiter (Planet), Saturn (Planet), Planetary Nebulae
Scientific paper
Modelings of terrestrial planet formation in the forward direction obtain the runaway growth of embryos in nearly circular orbits at spacings of a few 0.01 AU. Subsequent evolution to form a planetary system similar to the solar system with spacings of a few 0.1 AU is slow and unsure, if dependent entirely on gravitational interaction among the embryos. The effects of Jupiter and Saturn in their present orbits are reduced in stimulating collisions, because orbiters a few 0.01 AU apart will react in parallel ways to perturbations by a planet always more than 4 AU distant. Mechanisms that have been suggested to have stimulated the eccentricities include the loss of solar nebula of significant mass, the breakup and loss of an Earth-size body at the distance of the present asteroid belt, and the inward motion of Jupiter. But a backward approach from the final orbits may help estimate the likely orbits of the penultimate protoplanets, products of "oligarchic" growth.
Kaula William M.
Varadi Ferenc
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