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Mars: Dry ice 'hovercraft' sled down sand dunes
 
Mars: Dry ice 'hovercraft' sled down sand dunes
These examples of one distinctive type of Martian gullies, called "linear gullies," are on a dune in Matara Crater, seen at different times of year to observe changes. I(NASA/JPL-Caltech/Univ. of Arizona)
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