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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 ...

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, ...

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Recurrent slope lineae (RSL) are dark flows that extend downhill on Mars to form sandy patterns on its surface. Researchers have previously suggested they are made of liquid debris or dry granules.

Recurring slope lineae (RSL) are seasonal flows on warm slopes, and are especially common in central and eastern Valles Marineris, as seen in this observation by NASA’s Mars Reconnaissance Orbiter […] ...

First identified in the 1970s by NASA's Viking mission, long, dark markings snake down Martian slopes, sometimes stretching across Mars' surface for hundreds of feet. Scientists have watched some of ...