I believe in Aliens, you gotta be insane to say no when there are more stars in the universe than grains of sand of all the beaches on Earth. Each of those stars have planets orbiting around it, the probability is very very high...
Now, I don't believe that we'll ever get to see them, because of the sheer distance. It takes the fastest space craft we have, 100,000 years to get to Alpha Centauri, our nearest star...all that worm hole, black hole, speed warp BS is all science fiction. To get somewhere far you have to go really really fast for a really really long time...so we are confined in our Solar System, maybe never knowing of the other's existence...
Pic is a hoax
MKIV 6spd 1000hp Club