Blue Skies, A Storm Front, Over The North Pole Of Mars - NASA Says There Is Water Ice at the Pole

Mars has polar caps at both its north and south poles. Both caps include a permanent or residual cap visible year-round, and a temporary or seasonal cap that appears in winter and disappears in summer. In the north, the permanent cap is water ice, while in the south the perma- nent cap is mostly carbon dioxide ice with perhaps some water. The north's permanent cap is 10 times larger than the south's; it remains a mystery as yet why the caps differ so.



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