Odd Craters on Mars

Last October, the HIRISE instrument aboard the Mars Reconnaissance Orbiter grabbed this picture of a crater in the northern Arabia Terra region of Mars. This crater and several others in the same region contain oddly shaped deposits usually on the south side of the craters. All the odd craters are large, at least 600 m in diameter. The best guess (so far) is that the features were formed by the sublimation of water from ice-rich material stirred up by the substantial impacts which created the craters.

Image Credit: NASA

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