On September 10, 2025, NASA described the Perseverance rover’s Cheyava Falls rock sample as a potential biosignature, not as proof of Martian life. That distinction matters because discovering life on Mars would begin as a chain of evidence, review, replication, and competing explanations rather than a single press conference. NASA said the rock’s leopard-spot features could point to ancient chemical reactions that supported microbial life, yet …
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