A lot of aliens have visited Earth. But we don't have Shleemies, so they don't stay.
I often wonder what I would do if I went to another world where we were superior to them. I like the idea that the Egyptian Pharos were from outer space but wouldn’t they have had better weapons? If they were aliens we would have seen a bigger leap in technology except they may have invented religions to control our minds and squashed such technology.
I also like the concept the aliens turned us on to gold. Today we have Fort Knox and several other places where we keep all the gold. Gold is very valuable to them too but they have us dig it up for them. One day they’ll come to collect if they haven’t already.
Some think the rockafellors, J.P. Morgan’s, Carnegie, etc we’re aliens.
Some think aliens turned monkeys into humans 100,000 years ago. They came here and fucked monkeys.