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Nasa Rover's Sand-Dune Studies Yield Surprise

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Mars sand dune ripples

Two sizes of ripples are evident in this Dec. 13, 2015, view of a top of a Martian sand dune, from NASA's Curiosity Mars rover. Sand dunes and the smaller type of ripples also exist on Earth.

Credit: NASA/JPL-Caltech/MSSS

Some of the wind-sculpted sand ripples on Mars are a type not seen on Earth, and their relationship to the thin Martian atmosphere today provides new clues about the atmosphere's history.

From Jet Propulsion Laboratory/NASA
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