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Without more details this is not a very interesting new. Methane is an organic molecule and we have found it everywhere in space: http://en.wikipedia.org/wiki/Methane#Extraterrestrial_methan...

In the soil. They found organic molecules in the soil. So no methane but something solid I guess. And remember, they couldn't find methane yet on mars, Curiosity results were negative. http://www.nature.com/news/nasa-rover-yet-to-find-methane-on...

It could be methane molecules bound to sand particles. It would be surprising not to find methane on a planet in our solar system.