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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 are the only spacecraft to ever search for life outside of Earth. Curiosity doesn't have any direct life detection instruments on board, and its priority is to search for habitability, rather than life itself.]]
[[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]], indeed, the only spacecraft to ever search for life outside of Earth. But with new discoveries about the possibilities for liquid water both in microhabitats on Mars and the subsurface oceans of Europa and Enceladus, and the ethane / methane seas of Titan this is a top priority for future missions.]]
===Featured articles===
===Featured articles===
Life on Mars:
Life on Mars:
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