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
Key Takeaways
- 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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Published originally on New Scientist
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