NASA just announced that its Perseverance rover recently found some promising signs of ancient life on Mars. The rover obtained a sample of rock formed billions of years ago from sediment and there are biomarkers indicating the potential presence of microbes once upon a time.
Basically, the rocks contain minerals that typically form as a result of a chemical reaction between mud and organic matter. That doesn’t necessarily mean that Mars once had life, as the minerals can form due to nonbiological processors. However, it’s certainly one of the best pieces of evidence we have to point toward
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