NASA has announced that the properties of a rock in Jezero Crater qualify as a potential biosignature. The NASA Astrobiology Roadmap defines a biosignature as “an object, substance, and/or pattern whose origin specifically requires a biological agent.” By that standard, a confirmed biosignature would be as close as we can get to proof of alien life (though of course there is no final “proof” in the scientific method).

Rephrased in plain English: NASA found potential proof of alien life in our solar system. That’s a fact. But to know for sure, we need to start by bringing these samples home. Bringing potential evidence of Martian life back to Earth so it can be fully analyzed is worth the price tag, and worth loosening the overly strict “back contamination” rules. The cost of these biologi

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