Computer Science
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sci...205...56p&link_type=abstract
Science, vol. 205, July 6, 1979, p. 56-59.
Computer Science
20
Atmospheric Composition, Gas Analysis, Gas Composition, Pioneer Venus Spacecraft, Planetary Atmospheres, Planetary Evolution, Abundance, Argon, Carbon Dioxide, Chemical Composition, Gas Chromatography, Mass Spectrometers, Nitrogen Atoms, Planetary Temperature, Terrestrial Planets, Pioneer Venus, Rare Gases, Origin, Comparisons, Atmosphere, Volatiles, Earth, Mars, Hypotheses, Composition, Abundance, Temperatures, Argon, Accretion, Grains
Scientific paper
Comparisons are made between the volatile inventories of the terrestrial planets, including Pioneer Venus data, and the predictions of three classes of theories for the origin of planetary atmospheres. Serious difficulties arise for the primary atmosphere and external source hypotheses. The grain accretion hypothesis can account for the trends in the volatile inventory from Venus to earth to Mars, if volatiles were incorporated into planet-forming grains at nearly the same temperature for all of these planets, but at systematically lower pressures in the regions of planet formation farther from the center of the solar nebula.
Black David C.
Pollack James B.
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