Mars Global Surveyor: Mars For PressAs I said, Ol' Sol's pretty stable - but 'stable' in a star doesn't mean nothing ever changes...
New gullies that did not exist in mid-2002 have appeared on a Martian sand dune.
That's just one of the surprising discoveries that have resulted from the extended life of NASA's Mars Global Surveyor, which this month began its ninth year in orbit around Mars. Boulders tumbling down a Martian slope left tracks that weren't there two years ago. New impact craters formed since the 1970s suggest changes to age-estimating models. And for three Mars summers in a row, deposits of frozen carbon dioxide near Mars' south pole have shrunk from the previous year's size, suggesting a climate change in progress.
Mars Global Surveyor: Mars For PressA Martian year's about twice ours, so that's over a six year period - about half of a sunspot cycle. And apparently there's a lot of different cycles to consider. (Interesting article on Solar variation at Wikipedia - hadn't thought there was so much to the subject until I looked at that...)
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And for three Mars summers in a row, deposits of frozen carbon dioxide near Mars' south pole have shrunk from the previous year's size, suggesting a climate change in progress.
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posted by Balisong at 12:10 PM on July 15, 2006