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Ars Technica
Nov 22, 2017, 9:31 am169 ptsEnlarge / Those dark streaks come and go with the seasons. We still don't know what causes them. (credit: NASA/JPL-Caltech/Univ. of Arizona) Mars clearly had extensive water in the past, and there's still plenty of it locked up as ice in glaciers and the polar ice caps. But the atmosphere is too thin and cold…
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