[editor-surveyor]

"Methane is a common non biological substance on earth, correct?"

Strange statement!

Sewage treatment plants have to deal with tons of methane produced in biological decay every day. What is your definition of 'non-biological?'

[tpaine]

Carbon is the 4th most common element. Mixed with the most common, hydrogen, we get hydrocarbons. Methane is arguably the most common hydrocarbon in our solar system. Much of the methane on earth is arguably not biological in origin.

What is your problem with the concept of non-biological methane?