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This image provided by NASA shows the inner slope of a Martian crater which has several of the seasonal dark streaks called "recurrent slope lineae," or RSL, that a November 2017 report interprets as granular flows, rather than darkening due to flowing water. Arizona scientists said Monday, Nov. 20, 2017 that these lines appear more like dry, steep flows of sand, rather than water trickling downhill, at or near the surface. (NASA via AP)

This image provided by NASA shows the inner slope of a Martian crater which has several of the seasonal dark streaks called "recurrent slope lineae," or RSL, that a November 2017 report interprets as granular flows, rather than darkening due to flowing water. Arizona scientists said Monday, Nov. 20, 2017 that these lines appear more like dry, steep flows of sand, rather than water trickling downhill, at or near the surface. (NASA via AP)

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