When NASA launched the Mars projects of the early 2000s, its missions were guided by a central theme known as “Follow the Water.” The basic idea is that if humans are to colonize Mars, they’ll need to have water to drink. Ideally, that water would come from Mars itself, which overflowed with rivers three billion years ago. But now, researchers report in Nature Geoscience that water remains on the Red Planet, hidden in unexpected locations deep underground.
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