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 ...

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 ...

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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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 […] ...