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In my opinion it is highly unlikely we are the only intelligent beings in the whole universe. And who knows, maybe we're the aliens.
For us to be the aliens, we'd have to be the ones visiting them.
If they come here, it's the other way around.
I certainly believe there must be life of some form or another in the universe, likely even intelligent life. I'm not really one to say they've most definitely visited, but the possibility certainly stirs the imagination, and there's still so many events that have yet to be explained properly. It does make one wonder...