Is Methane The First Direct Sign Of Extra-Terrestrial Life?

Are microbes making the methane that's been found on Mars, or does the hydrocarbon gas come from geological processes? It's the question that everybody wants to answer, but nobody can. What will it take to convince the jury?

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<p><a href="http://www.physorg.com/news5695.html">Is Methane The First Direct Sign Of Extra-Terrestrial Life?</a></p> <p>Are microbes making the methane that's been found on Mars, or does the hydrocarbon gas come from geological processes? It's the question that everybody wants to answer, but nobody can. What will it take to convince the jury? </p>