Originally Posted by
Northern Star
I'm more of the opinion that they haven't visited because it's impossible to cross the vast distances. Physicists can come up with all the theoretical ideas they want - I think just because civilizations might be more advanced, there could also be a limit to how advanced they can be. They could have sent broadcasts, though. How would we know what to listen for? They're aliens...
Another idea I like is that we're in a computer simulation. It would actually explain a lot.