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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. The south’s seasonal cap is larger than the north’s, which is caused by the fact that the southern winter takes place when Mars is farthest in its orbit from the Sun.
I came across this picture of mars about 8 years ago on BBC.com article.