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Originally posted by Sydney
(1) The facts are that we have nothing to compare with besides our own earth, (2) and until we do, there's little point romanticising about incomprehensible lifeforms utilising their environment in such fanciful ways.
Anyway, why do I think intelligent life only exists on earthlike planets? I've mentioned this before in an older topic, but the moon causes the tides. (3) The tides are what encouraged earth's diversity of life, they compete, intelligent life is born, bla, bla, bla.
(4) If what they found on the rock from Mars indicates life, and it formed on Mars as did earth's on earth, then that's a pretty good indication that life is carbon-based, and not some cosmic mist.
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1- I agree entirely. It is very difficult to make generalized statements with only one example. Which is my entire argument in counter to yours.
2- Aww, but it's so much fun!
3- Huh? I've never heard of the tides as a factor in evolution. Could you expand a little?
4- Two things-
A- Mars is EXTREMELY similar to Earth, the only difference is that it's always been a little colder, so there weren't large enough deposits of unfrozen water to transform CO2 into carbonite rocks, so the volcanoes went dormant sooner, and the atmosphere didn't build up, meaning it just kept getting colder, and bam- mars is the way it is today. If you had made a difference of even just fifteen degrees in the early days, it could've been very similar to Earth now. Same with Venus, only it was too hot in that situation. In a primordial sense, the environments on Earth and Mars were almost identical, so comparing their life (if that is in fact what we found on Mars, we still aren't certain about that) doesn't provide much in the way of contrast.
B- You gotta remember, in a cosmic sense, Mars and Earth are really REALLY close together. It is not unfeasable at all that any life that appears on one is connected to the other, again, that whole common origin thing. Many biologists believe that funguses and early spores came to earth on comets, and it's been proven that volcanic eruptions can put plant seeds into the upper ionisphere, so who knows how far they can shoot microscopic organisms? Seeds, microorganisms, and especially fungal spores can, theoretically, survive absolute zero and still grow just fine, so who knows- perhaps life came here from mars, or the other way around. Similarities in life forms here and there aren't a good sign of any universal laws to the formation and evolution of life in the universe- just in our solar system, and even then just for now.
But, like you said, we only have one real, reliable example right now of a planet that has or had life. Ours. The point is kind of moot until we make first contact or something.
Klatu barata nectu, amigos.