Observations by NASA's Mars Reconnaissance Orbiter have detected carbon-dioxide snow clouds on Mars and evidence of carbon-dioxide snow falling to the surface. Deposits of small particles of ... more 
Observations by NASA's Mars Reconnaissance Orbiter have detected carbon-dioxide snow clouds on Mars and evidence of carbon-dioxide snow falling to the surface. Deposits of small particles of carbon-dioxide ice are formed by snowfall from carbo less 
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SPACE.com | Photo By NASA/JPL-Caltech
Mon, Sep 17, 2012 8:12 AM EDT