A chemical study has cast fresh doubt on claims by NASA scientists that a rock from Mars contains evidence of life. A California research team says a mineral structure inside the meteorite was made by non-biological processes, and not by ancient bacteria as proposed by some researchers at the National Aeronautics and Space Administration.
A NASA scientist says the research is flawed and does not prove that microbes never lived inside the rock known as Allen Hills 84001. The study has been published in the journal Science.
