What would we have to do to make water on mars drinkable? Is there water under the surface? Would we be able to make use of that water? Would we be able to make more water than mars already has? Does mars have enough water to sustain human life?

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Answer: Liquid water may still flow on Mars, but that doesn't mean it's easy to spot. The search for water on the Red Planet has taken more than 15 years to turn up definitive signs that liquid flows on the surface today. In the past, however, rivers and oceans may have covered the land.

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