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You guys simply go on and on missing the point. You just cant wrap your brains around the idea that you can't make any assumptions about what the possibilites are. "
we can, all theoretical science is making assumptions. yes we there will be all sorts of stuff cropping up that we didnt even think about, but we can safely make assumptions about certain things - like the presence of opposable thumbs on anything that manages to get into space. of course, what they use as cows or whatever (if they even have "cows") could be damn near anything...
sort of like if in 1250 the british knew north america existed, they could have assumed there would be trees.
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If you believe in evolution (like I do), then life on other planets probably evolved like life on Earth. We're still playing by the same rules, just on another planet."
similar to earth in some aspects, it'll do whatever it wants to so it will survive in the different enviroment. australia for example.