Mars Location Martian gullies. Scientists are actively debating the formation of gullies, which usually form in the presence of liquid water on the Earth. However, liquid water cannot exist on the surface of Mars under current atmospheric conditions. So how do gullies form on Mars? (Mars Global Surveyor, Mars Orbiter Camera image; NASA/JPL/Malin Space Science Systems)
Earth Analog This photo shows eroded gullies in Iceland that are very similar to many of those found on the surface of Mars. (Image credit: William K. Hartmann, Planetary Science Institute)
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