Aliens, that is to say, living beings in other parts of the universe certainly exist. If more developed than mankind they are not likely to find it interesting to travel all the way daring the long corridors of Space to find other forms of life. If they are less developed then they may not have the means to do so.
In any case it is best to keep a safe distance from each other. As such man can’t handle man himself, let alone aliens, especially since they would not have a psychic being which is unique to earth. Our work lies here and it is not worth spending time and energy in directions that are not of any real concern to us.
