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Home Martian gullies as seen in the top image from HiRISE on NASA’s Mars Reconnaissance Orbiter resemble gullies on Earth that are carved by liquid water. (NASA/JPL-Caltech/UA/JHUAPL) Martian gullies as seen in the top image from HiRISE on NASA's Mars Reconnaissance Orbiter resemble gullies on Earth that are carved by liquid water. (NASA/JPL-Caltech/UA/JHUAPL)

Martian gullies as seen in the top image from HiRISE on NASA’s Mars Reconnaissance Orbiter resemble gullies on Earth that are carved by liquid water. (NASA/JPL-Caltech/UA/JHUAPL)

Martian gullies as seen in the top image from HiRISE on NASA's Mars Reconnaissance Orbiter resemble gullies on Earth that are carved by liquid water. (NASA/JPL-Caltech/UA/JHUAPL)

Martian gullies as seen in the top image from HiRISE on NASA’s Mars Reconnaissance Orbiter resemble gullies on Earth that are carved by liquid water. (NASA/JPL-Caltech/UA/JHUAPL)