Mathematics – Logic
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cfa..colle..17c&link_type=abstract
CfA Colloquium Lecture Series Talk
Mathematics
Logic
Scientific paper
A wealth of recent orbital and surface measurements of the mineralogy, elemental abundance, and morphology of the martian surface have greatly improved our view of the history of water on Mars. Mineralogic data from orbital spectroscopy reveal a dry, volcanic planet that lacks extensive aqueous weathering or carbonate formation. However, there are local regions, such as the remarkable example of the Opportunity Rover landing site, where orbital and in situ observations suggest a lake once existed that produced significant localized aqueous mineralization. Mid- to high-latitude hydrogen abundances and unusual morphologies suggest that there are extensive accumulations of near-surface water ice that can melt during climate oscillations to form modern gullies. Overall, the upper surface of Mars appears to have an extensive water inventory, but this water may have existed in a frozen state throughout much of martian history.Can these disparate views of a "dry Mars",, a"wet Mars, and an "icy Mars" be reconciled into a coherent picture of the evolution of the climate and the state of water on this planet?
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