(BBC) The methane found on Mars is not brought to the planet by meteor strikes, scientists say.

Meteoritic material subjected to high temperatures did not release enough methane to account for the amount believed to be released on Mars.

The researchers argue that the methane must therefore be created by geologic or chemical processes, or it is a by-product of microbial life.

http://news.bbc.co.uk/2/hi/science/nature/8402741.stm

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