Computer Science
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...46...70w&link_type=abstract
Icarus, vol. 46, Apr. 1981, p. 70-80. NASA-supported research.
Computer Science
45
Argon Isotopes, Atmospheric Composition, Planetary Evolution, Solar Wind, Venus Atmosphere, Abundance, Earth Atmosphere, Krypton, Mars Atmosphere, Protoplanets, Xenon, Venus, Argon 36, Isotopes, Solar Wind, Origin, Models, Rare Gases, Accretion, Grains, Observations, Comparisons, Planetesimals, Xenon, Abundance, Irradiation, Enrichment, Gases, Mixing, Krypton, Atmosphere, Hypotheses, Venera Missions, Pioneer Venus
Scientific paper
An examination is conducted concerning the circumstances under which the difference between earth and Venus (and Mars) fits naturally into theories in which the terrestrial planets formed by the gradual sweeping up of planetesimals in an essentially gas-free protoplanetary swarm. The primary purpose of the reported investigation is to use observational data to define restrictions on planetary formation theories that would be imposed if most of Venus' inert gases come from the solar wind. The observational data support the suggestion that the abundances of Ar, Kr, and Xe on Venus have been augmented by a component of solar composition. Solar wind implantation at an early stage of accumulation provides a natural way of producing the observed extreme heliocentric distribution of this component, provided that accumulation occurred after dissipation of solar gas from the solar nebula
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