Given the vast amount of time involved and the vastness of the universe, I cannot believe that we are the only intelligent life that has ever evolved. However, I don't believe for a nano second that earth has been visited by any such beings.

I've always thought it's kind of arrogant to believe humans are the only "intelligent" life forms in the universe.

I'd have to say, we would be better off looking for some intelligent life here on Earth.

Somewhere? Yes. There must be. Contact with earth? No.

Wait! Is there intelligent life on this 3rd rock from our sun?

Given the vastness of the universe it seems more than likely, However a more telling question is whether the closest extra territorial intelligence is near enough to have any meaningful impact on us.
"Is there intelligent life elsewhere in our galaxy?" is a more interesting question.

It's possible. I would bet good money on some kind of life being out there. The universe is what? 12 billion years oldish and look at Earth; it us quite possible that many living things have come and gone through out the universe. And then, there is the possibility of a multiverse.

Surely all card-carrying profile-promulgating agnostics here should shout in unison "I don't know".

I consider it very highly likely that intelligent life exists on at least one of the other planets orbiting the 10^22 stars in the observable universe.

Just for arguments sake let us say that the galaxy has a billion systems where life could be possible. We live on one of those systems. If the odds are one in a billion and there are a billion other galaxies, how many systems have life on them? I know this is snot stated in the best manner possible, but the point is made.

It is very likely even if the life in question is not like us in any way.

I guess it is possible that there is intelligent life on other planets. After all, our knowledge is limited. But since Halloween and Thanksgiving are coming up soon, they are not gonna stop by; they are not impressed by the things we do on our planet.

The fact that we exist is the best evidence for other life in the universe. The idea that we would be the most intelligent life in the universe is both sad and perverse.

As vast as the universe is there has to be intelligent life somewhere.

I believe there may be life that we may not recognize as life.

I wonder what the poll results were on that other intelligent planet!

You'd have think that somewhere in this vast Universe there's intelligent life beside the little of it that is evident on Earth these days.

I voted “no,” given the way the question is written. Acknowledging the possibility is not the same as belief in an idea lacking supportive evidence.

Since conditions were right for life on earth, it is quite possible life evolved on another planet since there are so many planets in the universe which may also have the right conditions for life.

Have ask that to myself....finally decided it just wasn't relevant...

It’s possible. And humans ought to make every effort to stay away from them. One planet is beyond repair so far as we know.

It doesn’t matter. The speed of light, the principles of relativity and the implications it presents, the vast distances involved, create a condition I like to refer to as the “Cosmic Quarantine”.

I believe that all life forms eventually perish. Humanity will someday cease to exist without ever having ET contact whether such life exists or not.

Since we have no evidence of such life, it is entirely inappropriate to speak in terms of belief, with one exception: belief in the POSSIBILITY of such life. The presence of intelligent life on Earth proves that life can spontaneously arise on a planet with the right conditions.

Ask me again when you have invented a time machine.

I believe that with everything as spread out I think its likely. But that with those relativistic distances will be unlikely that any societies will find eachother.

It's in the realm of possibility.