Future interplanetary explorers beware: Hitchhiking bacteria brought to Mars on human bodies might not only survive the harsh conditions on the Red Planet’s surface but also potentially thrive.

Recent experiments exposed four common disease-causing microbes to a simulated Mars-like environment, with its lack of water, scant atmospheric pressure, deadly ultraviolet radiation and toxic salts. The bacteria remained alive for various periods of time and, in some cases, even grew in the imitation Martian sands, researchers report in the January Astrobiology.

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