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[[File:Sagan large.jpg|thumb|400 px|[[Carl Sagan]] with a model of the Viking Lander in Death Valley California. [[Viking 1]] and [[Viking II2|II2]] were the first spacecraft to [[Viking_lander_biological_experiments | search for present day life on Mars]]. So far they are the only spacecraft do do that - Curiosity doesn't have any direct life detection instruments on board.]]