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 ...

For years, scientists have been intrigued by mysterious dark streaks running down the slopes of Martian cliffs and craters. These marks, called slope streaks and recurring slope lineae (RSLs), have ...

Researchers analyzed a global database of 500,000 strange streaks that occur on steep Martian slopes, concluding that they're most likely caused by dry processes rather than liquid flow. A new study ...

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