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View Full Version : Arizona Scientist: We Could All Be Martians



Fraser
2009-Feb-21, 09:50 PM
As long as we’re still pondering human origins, we may as well entertain the idea that our ancestor microbes came from Mars. And Jay Melosh, a planetary scientist from the University of Arizona in Tucson, is ready with a geologically plausible explanation. Meteorites. "Biological exchange between the planets of our solar system seem not only possible, but inevitable," [...]

More... (http://www.universetoday.com/2009/02/21/arizona-scientist-we-could-all-be-martians/)

BigDon
2009-Feb-22, 04:52 AM
I thought the Surveyor 3 contamination was proven to be just that, contamination. If I'm wrong please tell me. If I'm right, tsk, tsk.

Van Rijn
2009-Feb-22, 06:07 AM
I thought the Surveyor 3 contamination was proven to be just that, contamination. If I'm wrong please tell me. If I'm right, tsk, tsk.

Well, "proven" might be too strong, but it is definitely now thought that it was post-flight contamination. For instance, from "Ask an Astrobiologist" (http://astrobiology.nasa.gov/ask-an-astrobiologist/question/?id=2701)



Yes, this microbe [streptococcus] was found on the Surveyor 3 camera that was retrieved and returned to Earth by the Apollo 12 astronauts. For many years it was thought that these microbes had survived their long exposure on the lunar surface. More recently, however, scientific opinion has shifted, and now we think these were probably contaminants introduced when the camera was retuned to Earth. It is very difficult to control such contamination, which is a cautionary tale for future return of samples from Mars. We don't want to identify life in such a sample and then be unsure if the life is from Mars or from Earth. David Morrison
NAI Senior Scientist
February 14, 2008


You still see this claim a lot though, sometimes even on NASA websites, presumably because not everyone has gotten the word.

jhwegener
2009-Feb-22, 08:59 AM
Perhaps there is some pieces from earth, as well as any other planet,
out there. The probabillity of finding them may be very small, but on the other hand perhaps we could get more information about early earth. Like the scientific results from Mars and Moon meteorites.

BigDon
2009-Feb-23, 10:02 PM
I recall reading the chain of custody of the Surveyor 3 probe was proven to be broken and after it was opened but before this was checked.