Does Titan's methane originate from underground?

Data from ESA's Huygens probe have been used to validate a new model of the evolution of Titan, Saturn’s largest moon, showing that its methane supply may be locked away in a kind of methane-rich ice.

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<p><a href="http://www.physorg.com/news11322.html">Does Titan's methane originate from underground?</a></p> <p>Data from ESA's Huygens probe have been used to validate a new model of the evolution of Titan, Saturn’s largest moon, showing that its methane supply may be locked away in a kind of methane-rich ice. <br></p>