auntblabby wrote:
germs transported inadvertently from earth, either from this most recent mission or earlier ones..
That would be disappointing but relatively easily checked if some samples can be brought back to Earth for analysis on a future mission. There are extromophile bacteria that live on Earth in more hostile environments than found on Mars so I think there is hope for such a discovery. If microbial life once existed on Mars I think it highly likely that it will still exist today, having evolved over millions of years to cope with the thinning atmosphere and reduction in available water. It is likely the changes to the climate of Mars were relatively slow which may have given enough time for adaptive evolutionary changes.
If living microbial life is found is would be extremely exciting to analyse its biochemistry and see if it is based on DNA and if so the same base-pairs as life on Earth or if it has evolved an entirely different biochemistry.
I'm keeping my fingers crossed and just hope the "Earthshaking discovery" isn't a false alarm or something less exciting such as the discovery of rare minerals. We should know within a couple of weeks anyway.
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I've left WP indefinitely.