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Mission to Mars' north poloar region Phoenix Mars Lander
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Early Spring Dust Storms at the North Pole of Mars
  Early Spring Dust Storms at the North Pole of Mars

Early spring typically brings dust storms to northern polar Mars. As the north polar cap begins to thaw, the temperature difference between the cold frost region and recently thawed surface results in swirling winds. The choppy dust clouds of at least three dust storms are visible in this mosaic of images taken by the Mars Global Surveyor spacecraft in 2002. The white polar cap is frozen carbon dioxide.

Image NASA/JPL/Malin Space Science Systems
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