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[[File:Sagan large.jpg|thumb|[[Carl Sagan]] with a model of the Viking Lander in Death Valley California. [[Viking 1]] and [[Viking 2|2]] were the first spacecraft to [[Viking_lander_biological_experiments | search for present day life on Mars]].<br><br>Indeed, so far these areindeed, the only spacecraft to ever search for life outside of Earth. CuriosityBut doesn'twith havenew anydiscoveries directabout lifethe detectionpossibilities instrumentsfor liquid water both in microhabitats on board,Mars and itsthe prioritysubsurface isoceans toof searchEuropa forand habitabilityEnceladus, ratherand thanthe lifeethane / methane seas of Titan this is a top priority for future itselfmissions.]]