Originally Posted by SuckOnThis

I think you seem to think that we can point a telescope at a planet outside of our solar system and determine if there is life, we cannot. Nor could we pick up their radio waves. And that is the CLOSEST planet. So when you say 'visible universe' what exactly does that mean? The Hubble would not be able to determine if there was life on Pluto.

Also you assume other intelligent life would have evolved to the point of interstellar space travel, we are far from that. And then there is the theory that if a planetary species has evolved to an intelligent form they would be the dominant ones on their planet and therefore an aggressive species and killed themselves off by nuclear war or whatever. But really, unless worm hole travel actually exists, or the possibility of manipulating the fabric of space there is simply to much space between planets. And who's to say we're not ancestors of an alien planet?

But remember this; there is NOTHING in the Universe that there is only one of.