Methane has been proven to be on Mars. Whether it is created from geological or biological is yet to be proven. It could also be ancient methane trapped. There obviously has to be many more tests and observations done before anything conclusive is found out. January 2003 was the first detection of Methane on Mars, in which the process began in 1999. They have a spectrometer that can measure methane up to 1 part per trillion. There will be another opportunity to launch an explorer to probe Mars, and the landing area will be determined within the next two years. The best way the scientists can determine whether this is biological or geological is a test of the Isotopes. Mars is our future. Read all about it from the NASA website:
http://www.nasa.gov/mission_pages/mars/news/marsmethane.html
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