You've had a hard day rolling past Martian rocks , so now just relax your APXS and enjoy the Martian sunset. The above pictures taken by Mars Pathfinder highlight how clouds vary during the end of a Martian day. The atmosphere on Mars is much thinner than on Earth and dominated by carbon dioxide rather than nitrogen . Clouds on Mars can be water or carbon dioxide based, depending on conditions , whereas Earth's clouds are all water based. Temperatures only this cold won't bother Sojourner .
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