Moon – traces are outgassed from the surface[22]
Mars – the atmosphere contains 10 ppb methane. In January 2009, NASA scientists announced that they had discovered that the planet often vents methane into the atmosphere in specific areas, leading some to speculate this may be a sign of biological activity going on below the surface.[23]
Jupiter – the atmosphere contains about 0.3% methane
Saturn – the atmosphere contains about 0.4% methane
Iapetus
Titan — the atmosphere contains 1.6% methane and thousands of methane lakes have been detected on the surface[24]
Enceladus – the atmosphere contains 1.7% methane[25]
Uranus – the atmosphere contains 2.3% methane
Ariel – methane is believed to be a constituent of Ariel's surface ice
Miranda
Oberon – about 20% of Oberon's surface ice is composed of methane-related carbon/nitrogen compounds
Titania – about 20% of Titania's surface ice is composed of methane-related organic compounds
Umbriel – methane is a constituent of Umbriel's surface ice
Neptune – the atmosphere contains 1.6% methane
Triton – Triton has a tenuous nitrogen atmosphere with small amounts of methane near the surface.[26][27]
Pluto – spectroscopic analysis of Pluto's surface reveals it to contain traces of methane[28][29]
Charon – methane is believed to be present on Charon, but it is not completely confirmed[30]
Eris – infrared light from the object revealed the presence of methane ice
Comet Halley
Comet Hyakutake – terrestrial observations found ethane and methane in the comet[31]
Extrasolar planet HD 189733b – This is the first detection of an organic compound on a planet outside the solar system. Its origin is unknown, since the planet's high temperature (700 °C) would normally favor the formation of carbon monoxide instead.[32]
Interstellar clouds[33]
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