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NASA’s Mars Reconnaissance Orbiter has revealed to scientists slender dark markings -- possibly due to salty water -- that advance seasonally down slopes surprisingly close to the Martian equator.

“The equatorial surface region of Mars has been regarded as dry, free of liquid or frozen water, but we may need to rethink that,” said Alfred McEwen of the University of Arizona in Tucson, principal investigator for the Mars Reconnaissance Orbiter (MRO) High Resolution Imaging Science Experiment (HiRISE) camera.

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