The streaks are called slope streaks and recurrent slope lineae (RSL), and they would suggest that there is water activity on Mars. Now it seems more plausible that they were formed by thin layers of ...

There’s long been conspiracy theories about the dark markings found the planet’s surface, with scientists having their own ...

Dark streaks on Mars that have puzzled scientists since their discovery in the 1970s are not evidence of water as many ...

Mysterious dark streaks first observed on Mars in the 1970s are not what many believed they were. Scientists now say the ...

For decades, scientists believed that long, dark streaks on the surface of Mars were a sign of something crucial: running ...

Strange, dark streaks on Martian slopes that once hinted at flowing water are now believed to be dry dust slides, revealed ...

A set of dark streaks that regularly wind across the Martian surface are more likely to be formed by dust and wind than by ...

Images taken of Mars from orbit dating back as far as the 1970s have captured curious dark streaks running down the sides of ...

NASA’s MAVEN finally sees sputtering—an escape process that stripped Mars of its atmosphere and ancient water.

A new study posits that dark streaks originally believed to be signs of water on Mars' surface might not be that at all.

Scientists have been arguing about the origin of strange streaks on Mars since the earliest missions to the Red Planet.