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You’re looking at massive Martian sand ridges known as “yardangs,” carved out of…

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You’re looking at massive Martian sand ridges known as “yardangs,” carved out of the terrain by the Red Planet’s ferocious winds. Individual ridges are huge — up to dozens of miles long and nearly half a mile wide! (If you’re wondering why the dunes appear blue, it’s because of the reflection from the thin layer of carbon dioxide ice frosting the planet’s sandy surface, plus a bit of color enhancement from NASA.) WowScience Credit: NASA/JPL-Caltech/University of Arizona

 

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