Computer Science
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976icar...27..553h&link_type=abstract
Icarus, vol. 27, Apr. 1976, p. 553-559.
Computer Science
5
Earth-Moon System, Planetary Composition, Planetary Evolution, Atmospheric Composition, Moon, Solar System, Venus (Planet)
Scientific paper
The paper shows that Wetherill's (1975) calculation of gravitational dispersal of planetesimals from different orbits allow quantitative proof that current models of planetesimal evolution necessitate compositional mixing of materials from remote sources onto each of the planets, with different fractions striking moon and earth. The only assumption in applying Wetherill's results to the earth-moon system is that the moon or protomoon be in orbit around the earth. Significant fractions of each planet's late-accreted mass originated not at its own distance from the sun, but from a neighboring planet's orbit. The moon could have the largest resulting anomaly in composition, these composition anomalies being most evident in the lunar uplands, which bear evidence of the late accretionary bombardment by planetesimals. Small reservoirs of planetesimals could substantially modify the moon's mean bulk composition without substantially modifying earth's. Crustal or atmospheric sulfur on Venus may not be as distinctive as Lewis (1972) has implied.
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