Signatures of methane-based life seen on Titan

Scientists are seeing hydrogen molecules flowing down through Titan's atmosphere, as well as a lack of acetylene. Theoretically, acetylene could be used as an energy source for methane-based life. And there's lots of methane on Titan. There's no "smoking gun," but the findings pose another intriguing mystery for astrobiologists. Here's an extra link about Titan's methane rain.