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  Is Mars' Methane Spike a Sign of Life? Here’s How We’ll Know

  

  wired.com

  The Curiosity rover detected a high concentration of methane on the red planet. Two Mars orbiters may soon clarify what that sighting really means.

  Science Science / Space

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  Mars Methane Hunt Comes Up Empty, Flummoxing Scientists

  

  scientificamerican.com

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