| http://www.w3.org/ns/prov#value | - However, it could also be due to volcanism or an unknown geological process on Mars since ???plumes??? of methane were identified in 2003 and the distribution of methane was found to be patchy.12 If the methane is of geological origin then it would actually make the martian surface very inhospitable for life.13 Moons of Jovian Planets Several moons of Jupiter and Saturn, including Europa, Titan, a
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