December 22, 2001
Dry Ice

Gee, I hope they get back before all this dry ice melts!

The thin layer of dry ice covering the Martian south pole begins to sublimate when Spring rolls around, changing directly into carbon dioxide gas. It sort of reminds me of this corner of Planet Earth. Please send real snow!

You can view a larger image and read the explanation at Nasa's picture-of-the-day archive.

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