Drippy Planet
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August 8, 2011
Possible rivulets of liquid water (the dark streaks in a band across the middle of the image) flow down the sides of a Martian gully in this image, which combines photographs from a Mars-orbiting spacecraft with a 3-D simulation of the terrain. Mars Reconnaissance Orbiter has seen rivulets appear in the same location every Martian spring and summer, suggesting that they are formed by liquid water spewing from below the surface. The water is probably quite salty, and would evaporate fairly quickly in the thin Martian atmosphere. [NASA/JPL/Univ. Arizona]
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