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New Scientist is reporting that terrestrial microbes who hitch a ride to Mars on spacecraft may be able to survive under special circumstances." From the article: "...Mars's thin atmosphere allows such intense ultraviolet radiation to reach the planet's surface - triple that found on Earth - that any life inadvertently carried on the spacecraft is thought to be wiped out quickly...However, the bacteria were able to stay alive if they were shielded by just 1 millimeter of soil during the tests, which ran for up to 24 hours. Under such a protective coating, the bacteria could survive - and potentially grow - under the high Martian UV flux if water and nutrient requirements for growth were met.
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