Caves on Martian volcano
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http://science.nasa.gov/headlines/y2007/21sep_caves.htm
I'm not so optimistic that Mars may have some form of life...
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hmmm.. bears can go live in the caves
but i've always wondered... why is our definition of 'life' so narrow?
as if only carbon-based and all that like us... i think the concept that life needs stuff like solar power and all that went to hell when we found abundant life in the ocean where smoking chimneys with temperatures which will kill most life on earth teeming with shrimp, crabs, tube worms and bacteria -
Maybe it's just humans' thinking? We've never encountered any non-carbon life forms before.