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Photograph: NASA/AFP/Getty Images
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This Mars Global Surveyor Mars Orbiter Camera image, released on August 26, shows a dust devil and its shadow in the Phlegra region of Mars.

Dust devils are spinning, columnar vortices of air that move across a landscape.

They are common occurrences during summers on Mars. The view shown here is 3-km wide.

Also see: To Moon and Back

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