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| Dry Ice Pits on Mars (September 26, 2011) |
This photo is evidence that parts of Mars are defrosting. Scientists know that the large carbon dioxide ice cap evaporates during the warmer season. The carbon dioxide dry ice sublimes (turns from a solid directly to a gas), leaving the pits that are shown above. Scientists are not sure of the chemical composition of the gold dust that surrounds the pit, but they do know that as Mars makes its way around the sun, its cooler season will stop the sublimation and freeze some of the carbon dioxide in the air.
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