Life Ain't Easy: What Would Make an Exoplanet "Earth-Like"? [Excerpt]
Thursday, April 30, 2015 - 12:01
in Paleontology & Archaeology
Two prominent scientists update our view of the history of life on Earth, featuring the prominent roles of oxygen and carbon dioxide, and question claims that it is fairly easy to initiate... -- Read more on ScientificAmerican.com