NASA made a big splash today, announcing that its Mars Perseverance rover had spotted "potential biosignatures" last year while examining a rock covered in unusual spots. It was a compelling finding, to say the least, with scientists suggesting "leopard spots" on a rock found near a rock formation, dubbed Bright Angel, may have been left behind by microbial life metabolizing minerals inside the rock. However, scientists were also cautious to point out that other chemical processes may have be...
