<<Michael Turner wrote:
> Not to be the killjoy troublemaker (who, me?), but what I mainly see in 
> this announcement is evidence of *liquid* movement. �Isn't "standing 
> body of liquid" the safer hypothesis?>>

Hi, everyone.

Under what circumstances does CO2 become a liquid?  I was under the impression that, 
on earth, at least, it turns straight from a solid into a gas.  It seems to me that 
its existance as a liquid would be highly unstable, at best, and that the likelihood 
that a standing body of liquid CO2 could exist long enough to create layered bedrock 
is virtually nil.

It seems to me as if the Mars rover team has been enormously conservative in its 
pronouncements, and that they would not have announced evidence for a significant 
standing body of water unless the evidence was pretty much indisputable.  I know 
Europa is our first love on this list, but it's beginning to look as if Mars is a 
pretty interesting place as well.

DS Michaels
==
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