What causes dark streaks on Mars?

Some scientists think the streaks are caused by surface flows of salty water and others believe it to be landslides.

via SPACE

Martian landslides might help explain mystery lines seen on the surface of the Red Planet, a new study finds.

For years, scientists analyzing the Martian surface have detected clusters of dark, narrow lines that seasonally appear on steep, sun-facing slopes in the warmer regions. Previous research has suggested that these enigmatic dark streaks, called recurring slope lineae (RSL), are signs that salty water regularly flows on the Red Planet during its warmest seasons.

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