Quote:
Originally Posted by Neverfly
Why?
We can make a lot of observations and base our educated guesses on a already existing knowledge.
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In which case they are merely educated guesses.
And we have the problem that we have very little data on what conditions are like on other worlds, so making sweeping statements of what can and can't be there is just vague guesswork until we actually go and look.
I'm not saying there are worlds full of life identical to what we find on Earth out there, merely that we don't know either way at this point. It seems extremely unlikely to us that we could meet other humans out there, but we are working from very little information of what out there is like.