Image of the Day: Great Blue Sand Dunes of Mars

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This is image of the Red Planet, snapped by NASA's Mars Reconnaissance Orbiter shows blue sand dunes covering part of the Rabe crater, a 100-kilometre-diameter impact site in the planet's southern highlands. The dunes are an accumulation of basalt sands from the crater's floor, sculpted by Martian winds. This granular image reveals the thumbprint-like texture of the ridges, troughs and ripples formed there.

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