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- W49109105 abstract "Abstract The clear evidence of water erosion on the surface of Mars suggests an early climate much more clement than the present one. Using a model for the origin of inner planet atmospheres by icy planetesimal impact, it is possible to reconstruct the original volatile inventory on Mars, starting from the thin atmosphere we observe today. Evidence for cometary impact can be found in the present abundances and isotope ratios of gases in the atmosphere and in SNC meteorites. If we invoke impact erosion to account for the present excess of 129 Xe, we predict an early inventory equivalent to at least 7.5 bars of CO 2 . This reservoir of volatiles is adequate to produce a substantial greenhouse effect, provided there is some small addition of SO 2 (volcanoes) or reduced gases (cometary impact). Thus it seems likely that conditions on early Mars were suitable for the origin of life – biogenic elements and liquid water were present at favorable conditions of pressure and temperature. Whether life began on Mars remains an open question, receiving hints of a positive answer from recent work on one of the Martian meteorites. The implications for habitable zones around other stars include the need to have rocky planets with sufficient mass to preserve atmospheres in the face of intensive early bombardment." @default.
- W49109105 created "2016-06-24" @default.
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- W49109105 date "1997-01-01" @default.
- W49109105 modified "2023-09-25" @default.
- W49109105 title "Mars: was There an Ancient Eden?" @default.
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- W49109105 doi "https://doi.org/10.1017/s025292110001472x" @default.
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