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PORTLAND PRESS HERALD DARKROOM
The surface of Mars

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    The surface of Mars - | of | Share this photo

    This undated photo provided by NASA and taken by an instrument aboard the agency's Mars Reconnaissance Orbiter shows dark, narrow, 100-meter-long streaks on the surface of Mars that scientists believe were caused by flowing streams of salty water. NASA/JPL/University of Arizona via AP

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    The surface of Mars - | of | Share this photo

    Dark narrow streaks called recurring slope lineae emanate out of the walls of Garni crater on Mars. Scientists have found the first evidence that briny water may flow on the surface of Mars during the planet's summer months, a paper published on Monday showed.

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    The surface of Mars - | of | Share this photo

    Portions of the Martian surface show many channels from 1 meter to 10 meters wide on a scarp in the Hellas impact basin, in this photograph taken January 14, 2011.

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    A handout image made available by NASA shows dark, narrow, 100 meter-long streaks called recurring slope lineae flowing downhill on Mars that are inferred to have been formed by contemporary flowing water. Getty Images

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