If Mars Once Hosted Life, How Would We Know?

Despite a few press-stopping false alarms and a long-standing sci-fi fascination, there’s no evidence of biology — microscopic, trilobitish, or creepily humanoid — on Mars.

But that hasn’t stopped the Curiosity rover from running around saying “This spot would have been habitable” and “That spot definitely has water.” And it hasn’t stopped astronomer Nathalie Cabrol from searching for the ever-elusive “biosignatures”: evidence, like geological graffiti, that proclaims “LIFE WUZ HERE.”

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