If they exist. But don't ghosts come from outside of our reality? Are aliens dead people?

Wait they're on an alternative planet co-existing with our own in an alternative universe of the anti-matter, through the blackholes?

Or not? They haven't been proved outside of speculation on UFOs. Why would they exist in another dimension and not within our universe?

If they exist. But don't ghosts come from outside of our reality? Are aliens dead people?

Wait they're on an alternative planet co-existing with our own in an alternative universe of the anti-matter, through the blackholes?

Or not?