Physics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978m%26p....19..289l&link_type=abstract
(Conference on Protostars and Planets, Tucson, Ariz., Jan. 3-7, 1978.) Moon and the Planets, vol. 19, Oct. 1978, p. 289-296.
Physics
4
Planetary Mass, Planetary Nebulae, Solar System, Terrestrial Planets, Cosmology, Escape Velocity, Gravitational Effects, Planetary Evolution, Systems Stability
Scientific paper
It is suggested that relative velocities of planetesimals are much smaller during the first stage of accumulation than Safronov (1969) had assumed. According to Safronov, relative velocities of planetesimals are on the order of the escape velocity of the largest body of the population, but it is shown that this statement is correct only when a major part of the total mass resides in several large bodies, which is not the case during the first stage of accumulation, when runaway accretion produces large bodies separated by mass from the remaining population. If slow relative velocities are assumed, Schmidt's (1945) accumulation scheme for the terrestrial planets must be modified, and the author's (1972) arguments in favor of a protoplanetary nebula with an extended periphery are no longer valid.
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