PerspectivePlanetary Science

Update: The Early Mars Climate Question Heats Up

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Science  14 Nov 1997:
Vol. 278, Issue 5341, pp. 1245
DOI: 10.1126/science.278.5341.1245

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Results from Pathfinder and elsewhere indicate that early Mars harbored liquid water on its surface. Kasting's Perspective describes two recent ideas as to how the atmosphere remained warm enough for this to be possible, one presented in this issue (p. 1273). Forget and Pierrehumbert suggest that COice clouds could have reflected enough infrared energy back toward the martian surface to maintain water in its liquid state.