I myself believe it is possible, but I don't think it is a sure thing.
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 since we exist. (begging the question of whether or not humans are intelligent life,) but since we don't know how likely the evolution of it is (it only evolved once on Earth,) no way to know. If it's only as likely as a monkey typing Hamlet by chance for example, we are indeed alone.
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 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.