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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.]]
 ===Featured articles===
-Astrobiology:
-* [[Astrobiology]]
-* [[Abiogenesis]] - about the natural process of how life arises from non living matter
-* [[Panspermia]] - transfer of life between planets on meteorites.
-* [[Terrestrial analogue sites]]
-* [[Murchison meteorite]]
 Life on Mars:
 * [[Possible present day habitats for life on Mars]]
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 * [[Life on Titan]]
 * [[Life on Venus]]
+Astrobiology:
+* [[Astrobiology]]
+* [[Abiogenesis]] - about the natural process of how life arises from non living matter
+* [[Panspermia]] - transfer of life between planets on meteorites.
+* [[Terrestrial analogue sites]]
+* [[Murchison meteorite]]
 Planetary protection:
 * [[Planetary protection]]

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