Puzzles persist about possible water at seasonally dark streaks on Martian slopes, according to a new study of thousands of such features in the Red Planet’s largest canyon system. The study published ...

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Dark streaks on Martian slopes called Recurrent Slope Lineae (RSL) have been seen from Mars orbit for years, and various theories have been proposed about how they form. The latest suggestion, ...

Recurring slope lineae are Martian seasonal features characterized by a low brightness (albedo) during local spring/summer that fade during winter/late summer. Their daily characterization through a ...