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A new theory is pouring some cold — actually, some really hot — water on the idea that Mars could have been habitable in the past.

Planetary scientists searching the Red Planet for places that could have contained the building blocks for life look for clues in clays, which can offer some indication that water must have flowed on or just under Mars' surface. But a new study suggests that, at least in some cases, those clays might be a red herring.