Gullies on Mars Carved by Dry Ice, Not Water

July 16, 2014 3:40 PM

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Gullies on Mars Carved by Dry Ice, Not Water

This image of the surface of Mars covers a location that has been captured several times by the HiRISE camera aboard NASA's Mars Reconnaissance Orbiter to look for changes in gullies.

Running water didn't create the channels that crisscross the surface of the Red Planet, a new study suggests.

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