"Scientists announced Thursday that they had detected dozens of slopes across the southern hemisphere of the planet where previously undetected dark streaks come and go with the seasons. When the planet heats up, the streaks appear and expand downhill. When it gets cold, the streaks disappear.
"The best explanation they have so far is that those dark fingerlike streaks are a kind of salty water that is running on or just below the Martian surface."
Full article: Scientists find evidence of running water on Mars.
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