astroengine writes: "In the 1970's, NASA's Viking Mars landers carried out experiments on the Martian soil to search for organic compounds. For 30 years the results of these experiments have been hotly contested. Long assumed to be contamination from Earth that gave a false positive in one of the key experiments, findings from the 2008 Mars Phoenix lander and recent tests on perchlorate-laced material from the Atacama desert have prompted NASA scientists to believe Viking really did discover organics 30 years ago."
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