Seen from space, regions of Mars around the south pole have a bizarre, pitted 'Swiss cheese' appearance.
around the south pole have a bizarre, pitted"Swiss cheese" appearance. These formations come from alternating massive deposits of COFor decades, planetary scientists wondered how this formation was possible, as it was long believed that this layering would not be stable for long periods of time.
Now, in a follow-up study, Buhler was able to model how the frozen carbon dioxide and water deposits grow and shrink over 100,000 year-long cycles of Mars's polar tilt. "These variations cause the amount of sunlight shining on each latitude band, and thus the temperature of each band, to cycle, too. Water ice moves from warmer to colder regions during these cycles, driving Mars' basic long-term global water cycle."ice can provide a record of Mars's climate history, as the south polar ice cap is the only place on the red planet where frozen carbon dioxide persists on the surface year-round.
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