... Tonight's Sky . ... Observing . ... Astronomy for Kids . ... What is consuming hydrogen and acetylene on Titan? Some scientists believe these chemical signatures bolster the argument for a primitive, exotic form of life or precursor to life on Titan's surface. ... We suggested hydrogen consumption because it's the obvious gas for life to consume on Titan, similar to the way we consume oxygen on Earth," McKay said. ... Only registered members of Astronomy.com are allowed to comment on this article. ...