Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21510601z&link_type=abstract
American Astronomical Society, AAS Meeting #215, #106.01; Bulletin of the American Astronomical Society, Vol. 42, p.326
Mathematics
Logic
Scientific paper
Recent observations of Mars from orbiting and landed spacecraft have dramatically changed our understanding of the distribution and amount of water at and beneath the surface throughout the planet's history. There is definitive evidence for a watery past, including standing water on the surface, during Mars’ early history, and the details of the global hydrological cycle, groundwater upwelling and aqueous chemistry have been elucidated. There is evidence that much past surface water is currently stored in the upper crust in the planet's impact-generated regolith. Present-day Mars contains abundant water ice within a meter of the surface, with an apparent clean ice layer overlying a heterogeneous ice table. There is evidence that that liquid water in small quantities exists on the surface in certain places and at certain times during the Martian year. Observed properties of present-day ice provide constraints on the diffusion of subsurface water to the atmosphere. Future observations hold the promise of further enhanced understanding of the state and mobility of water throughout Martian history.
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