There are multiple locations where scientist have detected methane or believe it to be present. Abiotic processes are responsible, although there is a possibility of biotic origin on Mars. Other locations include: Moon, Jupiter, Saturn (and its moons Iapetus, Titan, Enceladus), Uranus (and 5 out of its satellites), Neptune (and its moon Triton), Pluto and Charon, Eris, comets Halley and Hyakutake, extrasolar planet HD 189733b, and interstellar clouds. Out of those, the most significant atmospheric concentrations are on Uranus (2.3%), Enceladus (1.7%), Neptune (1.6%), and Titan (1.6%).
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