QUOTE (djellison @ Mar 12 2004, 08:20 AM)
Apart from the fact there is a proven geological process behind how they formed.
Give up, honestly, I see no reason to suggest there is a posibility they are fossils - no reason at all. They dont even look like fossils.
Also - given the air pressue and temperature on mars, it's impossible for liquid water to exist on the surface - so there is nothing that could 'look wet'
Doug
Just a few points here:
There are some fossils on earth that are spherical and can have "stems". And how can we guess beforehand what fossils on another planet should or should not look like anyway? That's earth-based chauvinism.
Some concretions are now known to have been created by bacteria (they are still made of minerals, but the creation process is augmented by microbiology). That option is still open also.
Re anything "flagging up", they only just did the Mossbauer measurements, etc. of the spherules in the blueberry bowl within the last day or two, so no results released yet, and so we don't even know yet what has shown up in the results and what hasn't. They also haven't even left the crater yet, for more comparison studies.
I posted the new image of the stemmed blueberry in the other topic 'Marble on Stem' last week, a better view of it than previous images (there are others also). I agree that geology could do that conceivably, but you have to admit it is odd-looking. Has anyone here seen that one yet? These objects are certainly interesting, in any case.
I just think it's too early to say anything definite still. Geology and biology can sometimes mimic each other, and with the instruments we have on these rovers, we may never know for certain. If this area was under standing water (and they are leaning toward that concept now I've heard as opposed to underground water percolating upwards), why is it so inconceivable that life could have been there? I'm not saying these things must be related to biology at all as some do, but the possibility, even if small perhaps(?), still cannot be just dismissed out-of-hand.
Also, re the "rotini" object, JPL has acknowledged being puzzled by it. That thing does have a "fossil-like" appearance to it. It may be or may not be, but again another candidate which cannot just be dismissed too quickly. I too wish these rovers were equipped for organics and biology also!
Re water, other studies have shown that minute amounts of briny water could exist today in the soil, at least near the equator (where temperatures can go above freezing). Perhaps more even just below the surface. Why do some people seem to think this is so impossible?
Chaosman - can you say who your two NASA contacts were?
Finally, contrary to what has been erroneously stated recently sometimes, there _are_ exobiologists / biophysicists involved with the MER team - Andrew Knoll and Benton Clark (who also spoke at the water press conference) at least that I know of, both with extensive backgrounds in these areas. It is just that geology is at the forefront for the public and media as this is a geology mission.
Paul