Scientists Find 4-Billion-Year-Old Fossil Riverbeds on Mars

Evidence is mounting that early Mars was warm and wet — and potentially habitable for alien life.

A study published Tuesday in Geology found an extensive network of ancient river beds in a region of the Red Planet where no evidence of fluvial activity had been previously found. The new data helps bring observations in line with climate models that assume ancient Mars had a healthy water system.

The researchers focused on an area called Arabia Terra, which is about the size of Brazil....

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