Methane in Enceladus Geysers Could Come From Alien Life

Years back, when NASA's Cassini-Huygens probe explored the Saturnian system, scientists were fascinated to see how much methane was present in Enceladus' geysers. At the time, it seemed feasible the methane was naturally occurring, but that's less likely now that new research has ruled out all the known geochemical processes.