Despite false claims in the press last week that some NASA scientists had discovered evidence for present life on Mars, there is no such evidence yet.
The Space.com story from Feb. 16 was based on "inaccurate hearsay," according to one of the scientists involved, and on Friday, NASA actually issued an official denial. Quite rare for an organization that normally thrives on talk about the potential for life elsewhere in the Solar System.
http://msnbc.msn.com/id/6994667/">NASA rejects claims of life on Mars
NASA on Friday issued an unusual denial of a report that its researchers saw strong evidence for life's existence on present-day Mars, based in part on atmospheric methane readings. Other scientists involved in Mars research said the jury was still out on the meaning of Martian methane, but they agreed that the preliminary findings were well worth a follow-up.
Earlier this week, sources told the weekly Space News that Carol Stoker and Larry Lemke, astrobiologists at NASA's Ames Research Center, had submitted a paper to the journal Nature outlining the evidence for biological activity on the Red Planet.
But in Friday's statement, NASA said such reports were "incorrect":
"NASA does not have any observational data from any current Mars missions that supports this claim," the statement read. "The work by the scientists mentioned in the reports cannot be used to directly infer anything about life on Mars, but may help formulate the strategy for how to search for Martian life. Their research concerns extreme environments on Earth as analogs of possible environments on Mars. No research paper has been submitted by them to any scientific journal asserting Martian life."
I've written more on this here:
http://pmbryant.typepad.com/b_and_b/2005/02/life_on_mars_no.htmlHere is the
thread posted about this in the Science forum last week. I felt the correction of the original report deserved a new thread with a new headline.
--Peter