NASA's Curiosity rover uncovers a 3.5 billion-year-old secret hiding beneath its surface-- Here's what it is

NASA's Curiosity rover has unearthed compelling evidence of a past carbon cycle on Mars, discovering siderite within Gale Crater's ancient rocks. This finding suggests Mars once possessed a thick, carbon dioxide-rich atmosphere and liquid water, potentially supporting microbial life around 3.5 billion years ago.

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