Mars Craters Tell Story of Water and Ice

Mars Craters Tell Story of Water and Ice
Tongue-shaped features called lobate flows were seen on the wall of a 37-mile (60-km) diameter crater on the Martian surface. (Image taken with the Mars Oddysey THEMIS VIS camera.)
(Image: © NASA.)

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Berman and his colleagues have estimated the ages of some of these crater features using a technique known as crater counting, finding they range from 1 million to 10 million years old --relatively young, geologically speaking.

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