Possible precipitation of ice at low latitudes of Mars during periods of high obliquity

  title={Possible precipitation of ice at low latitudes of Mars during periods of high obliquity},
  author={Bruce M. Jakosky and Michael H. Carr},
  • B. Jakosky, M. Carr
  • Published 13 June 1985
  • Environmental Science, Geology, Physics
  • Nature
Most of the old cratered highlands of Mars are dissected by branching river valleys that appear to have been cut by running water1,2 yet liquid water is unstable everywhere on the martian surface. In the equatorial region, where most of the valleys are observed, even ice is unstable3,4. It has been suggested, therefore, that Mars had an early denser atmosphere with sufficient greenhouse warming to allow the existence of liquid water5. Here, we suggest instead that during periods of very high… 
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