<div xmlns="http://www.w3.org/1999/xhtml">It is known that Mars has frozen water at its poles and water vapour in its atmosphere.* Today researchers associated with NASA's Mars Reconnaissance Orbiter have identified flowing water on Mars' surface.
Imagery of Mars' surface shows dark streaks that reappear periodically on slopes.* These streaks, which appear and grow in the downslope direction during warm seasons when temperatures reach about 250–300
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