Quote:
Originally Posted by Mr. Charlie
It's not far fetched if you think about it. Life wasn't put on Earth, it didn't come into this world, it came out of this world. We're suited to our environment because we were created from the environment. Who's to say lifeforms from and in different environments can't exist without water, oxygen, and other things we deem necessary? Man is not the measure of all things. Man is the measure of man.
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While I agree that the first life forms here came about as a cause of organic chemistry, there have been meteorites that have had bacteria on them. It's still a possibility that the earliest life forms could have come from space, making us the alien visitors. Also, we ready have a lot of anaerobic organisms who don't need water here on earth too so that's definitely possible too.
As far as tore's point about us not being able to recognize alien life, I'm kind of with Hawking on this one. There's no real way to validate either side, but I think the adaptability of life on earth suggests that life forms could adapt to be something like what he describes. Really hard to know for sure, but some of the life on earth is kind of far fetched sounding too.