Is their alien lifeforms in this universe? More than likely but that is still making a false assumption. All I can say is it would be quite arrogant to think our civilization on Earth is the only one that had a chance at having life. Especially, considering my Astronomy professor says that based on research, more than likely every star has planets going around them, there is always a chance for another "earth" like case. Of course we also shouldn't think that every creature out there has to be carbon-based and needs water to live... could be rather different.
Anyways, have we ever seen aliens? Potentially, but probably not in the forms people say they have. The mind sees what it wants to see. If you want to hear god talking to you then you will hear god talking to you. If you want to see Jesus in a waffle, then shit you will probably see it. If you want to see ghosts and think a haunted place is haunted then chances are you will have that experience. Same thing with aliens. Whether it is a distortion of something peculiar or simply the brain hallucinating to satisfy itself, you will probably end up having that experience. I also don't take into account those who say they were "skeptics" or non-thinkers of the situation beforehand because I doubt that is actually the case.
And I'm not trying to suggest those people are just simply insane, but it's something the human brain does on a daily basis. We do it without thought, and we just have problems understanding it because of our obsession of separating ourselves into a physical and metaphysical being. Guess we need to give more credit to our capable brains.
But my reasoning for the potential alien interactions would be based on how long they have been around. If it is a civilization that had been around for hundreds of thousands of years or maybe millions, then more than likely given human progress they would probably be spacefaring creatures (as given a volatile universe... or at least volatile at some points in history, there is a necessity to be spacefaring). So there is always that slim chance of being close enough to our solar system to interact with early man or even man nowadays.
Then my other reason is always the notion of early religions with gods seemingly being alien-like in the way they are described. Even as far up to a lot of the modern religions which always seem to point up to the heavens. Also the Egyptian pyramids are another mystery which would looks seemingly impossible for such an early culture and virtually impossible in the 22 years we are supposed to believe it was crafted in.
But those are just little bits and some with my own personal opinions on them which really have no merit to suggest anything but that's what I think.
