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The origin of planetary atmospheres
S. J. Bauer
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Abstract
Reasons for the difference in planetary atmospheres are reviewed. Atmospheric formation by outgassing from terrestrial planets is contrasted with the retention of the primary material by the outer planets. The differences in Venusian, earth, and Martian atmospheres are explained in terms of planet distance from the sun. Data on terrestrial planet pressures, temperatures, and gas compositions, as well as on rates and gas composition of outgassing material are presented. The significance of planet mass is considered.