SPACE PHOTOS THIS WEEK: Hubble Repairs, Huge Moon, More

SPACE PHOTOS THIS WEEK: Hubble Repairs, Huge Moon, More
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May 13, 2009--Dark sandy patches speckle the frost-coated dunes inside Mars's Richardson Crater, a 34-mile-wide (55-kilometer-wide) depression in the planet's south polar region.

As temperatures rise with the onset of spring, some of the carbon dioxide frost on the dunes turns directly from solid to gas. The dark blotches and streaks may be areas where frost has vaporized, or they could be regions where small avalanches triggered by the thaw have covered the frost with sand.
—Image courtesy NASA/JPL/University of Arizona
 
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