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flag NASA's Curiosity rover finds evidence of a carbon cycle on Mars, suggesting past habitability.

flag NASA's Curiosity rover has found evidence of a carbon cycle on Mars, suggesting the planet could have supported life in the past. flag The discovery of siderite, an iron carbonate mineral, in Gale Crater indicates Mars once had a climate with enough carbon dioxide to support liquid water. flag While Mars' atmosphere has thinned over time, these findings help scientists understand the planet's potential to harbor life and its climate history.

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