Carl Sagan portrait NASA

Carl Sagan portrait NASA

Famed late NASA astronomer Carl Sagan first hypothesized that the reason early Earth stayed warm although the sun shone dimly had to do with a greenhouse effect involving a gas mixture different from that in Earth's atmosphere today. He suspected high ammonia levels, which proved chemically less feasible. Today, many scientists suspect the warming gas was methane. Credit: NASA-JPL

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Research, Aerospace, Chemistry and Chemical Engineering, Environment, Life Sciences and Biology
methane, atmosphere, faint young sun paradox, Chris Reinhard, Kazumi Ozaki, exoplanets, Astrobiology Institute
  • Created By: Ben Brumfield
  • Workflow Status: Published
  • Created On: Dec 11, 2017 - 10:54am
  • Last Updated: Dec 11, 2017 - 10:54am