Two NASA space probes that visited Mars 30 years ago may have stumbled upon alien microbes on the Red Planet and inadvertently killed them, a scientist theorizes in a paper released Sunday.
The problem was the Viking space probes of 1976-77 were looking for the wrong kind of life and did not recognize it, the researcher said in a paper presented at a meeting of the American Astronomical Society in Seattle.
This new report, based on a more expansive view of where life can take root, may have NASA looking for a different type of Martian life form when its next Mars spacecraft is launched later this year, one of the space agency's top scientists told The Associated Press.
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