The discovery of liquid (albeit very salty) water on Mars may suggest that the Red Planet is more habitable than previously thought, according to scientists. Strange, dark streaks that run down the sides of hills on the surface of Mars are formed partly by the presence of liquid water, scientists announced today (Sept. 28). Using NASA's Mars Reconnaissance Orbiter (MRO), the researchers say they now have strong evidence that salty water soaks the planet's surface soil, perhaps even flows down the slopes, and creates the dark streaks.
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via RO Water Filter