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Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown Wikenigma - an Encyclopaedia of Unknowns Wikenigma - an Encyclopaedia of the Unknown

Mars - methane

In 2004, three different research groups independently announced the discovery of significant concentrations of methane in the atmosphere of Mars. But the predicted lifetime of methane in the Martian atmosphere has been calculated at just 200 days source - so it appears that the gas must be being constantly generated by as yet unknown mechanism(s) - possibly geochemical processes, volcanic or hydrothermal activity, or lifeforms.

Further reading: Methane on Mars (The Economist)

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