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...All that has happened is they have found methane and therefore they are saying there must be life...
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Oh no they're not!
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...Methane has been found in the Martian atmosphere which scientists say could be a sign of present-day life on Mars...
...Is there life beneath the soil?...
...On Earth bacteria produce methane from hydrogen and carbon dioxide. Terrestrial microbes that produce methane do not need oxygen to thrive, and these are thought to be the type of microbes that could possibly live on Mars.
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All they are saying for certain is that something must be replenishing the methane that has been detected in the atmosphere.