• Long ridges in the dark Martian soil appear almost human-made, but they are natural formation known as linear dunes.
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    NASA has found linear dunes on Mars (pictured), Venus, and Titan, which only adds to the mystery of how they form. (NASA)

  • Long ridges in the dark Martian soil appear almost human-made, but they are natural formation known as linear dunes.

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January 14, 2010

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NASA

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