Spider-shaped features in the south polar region of Mars are carved by vaporizing dry ice in a dynamic seasonal process. This image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter includes several of the distinctive features in an area 1.2 kilometres wide.
http://www.marsdaily.com/reports/Radial_Channels_Carved_By_Dry_Ice_999.html
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