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    Dunes of Mars

    In yet another cool image from the HiRISE camera on the Mars Reconnaissance Orbiter near Mars, we see these dunes on the planet's surface. This image comes from the Hellespontus region of Mars, where sand from local mesas has been molded into these shapes by high intensity winds. No word yet on whether the famous canals of Mars are actually wormsign. You can learn more about Martian sand dunes here. Photo via AP, HO, and NASA.
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    Dust Devils Of Mars

    The Martian wind has cut deep crevasses into this crater in the Terra Cimmeria region. The edges of these dunes look sort of like fins in this new image from the HiRISE camera on the Mars Reconnaissance Orbiter. But the fins are actually double "horns" where the wind from the East hit the dunes. You can also see "dark, sinuous forms" where Martian "dust devils" pushed away the brighter dust and uncovered the darker surface. Click through for another image. More »