Rusty crust made Mars warm and wet

Summary
It's unclear how and why Mars once became warm enough to allow water to flow on its surface, but a new idea suggests it comes down to rust below the surface
Description from Newscientist.
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Rusty crust made Mars warm and wet
It's unclear how and why Mars once became warm enough to allow water to flow on its surface, but a new idea suggests it comes down to rust below the surface
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