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We knew there was ice, but not any flowing liquid water.
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Uh, no, we knew. During the Martian summer, the red planet heats up to 90°F, melting most ice.
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Technically we were never 100% sure, but now we are according to NASA.
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Edited by I Love Mai Waifu: 9/28/2015 11:48:03 PMNo, similar to Earth, Mars's ice caps stay frozen year round. The Carbon Dioxide layer does sublimate as temperatures increase, but the water does change forms. [spoiler]Wikipedia can at times be wrong, but this info is pretty solid. https://en.m.wikipedia.org/wiki/Martian_polar_ice_caps [/spoiler]
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Edited by shell: 9/28/2015 11:49:13 PMI wasnt talking about the permafrost.