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Originally Posted by Lasereth
I also believe that there is no way of telling or even guessing that extra terrestrial life exists. Many say that since there are billions of stars in our galaxy surely there are planets with life. Right? Riight?? The problem is, we don't know how lucky we are. We don't know if we're flukes or if we're the norm. Until we know that it's impossible to guess if life exists on any scale. Look at Mars. Look at Venus. Those are what Earth should have been, but by a stroke of luck we didn't melt or freeze.
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I would say that the chance of there being no other planets out there with our climate is pretty much nill. If there is a planet in orbit at the right distance it will be in that goldilocks zone.
As for life, the only 'what if' is how unlikely it is to start up on its own. If its 1 in a million, we are not alone, if its 1 in a billion, we are not alone, but thats the one factor in the drake equation which is a true unknown which can't be guessed at with any accuracy.
Once you get that life, evolution will take care of the rest.