<p>Spring Frost on a Cold World
</p><p>Winter on Mars comes with a blanket of carbon dioxide snow. During the spring “thaw,” this snow evaporates into the atmosphere, lingering longest in the shallow depressions such as the troughs of polygon patterned ground.
</p><p>Enhanced color shows the carbon dioxide snow as bluish-white patches among areas of rusty red bare ground. We took this image in 2008 as a possible landing site for the Phoenix Lander that arrived on Mars later that same year.
</p><p>NASA/JPL/University of Arizona (Alt: 319 km, less than 1 km across.)
</p>
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