Briefing: As Mars Express sends back the best ever data about the chemicals present in the martian atmosphere, rumours abound that scientists are beginning to detect signs of life on the red planet. news@nature.com weighs up the evidence so far.
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Peplow, M. The search for life on Mars. Nature (2004). https://doi.org/10.1038/news040726-3
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DOI: https://doi.org/10.1038/news040726-3
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