![Large storm system high above Mars’s north polar region, photographed by Mars Global Surveyor on …[Credits : NASA/JPL/Malin Space Science Systems]](http://media-2.web.britannica.com/eb-media/26/75426-004-7452FE5F.jpg)
Large storm system high above Mars’s north polar region, photographed by Mars Global Surveyor on June 30, 1999. The “curl” consists mainly of water-ice clouds mixed with orange-brown dust raised from the surface by high winds. The north polar cap is seen as a spiral pattern of light and dark bands at the upper left.
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