Methane in the Plumes of Saturn's Moon Could Be a Sign of Alien Life

After NASA's Cassini spacecraft discovered a surprisingly large amount of methane -- along with a relative high concentration of dihydrogen and carbon dioxide molecules -- in the plumes of Saturn's moon, Enceladus, a study published in Nature Astronomy concludes that the high levels of gas cannot be explained by known geochemical processes."We wanted to know: Could Earthlike microbes that 'eat' the dihydrogen and produce methane explain the surprisingly large amount of methane detected by Cassin...