Ghosts are commonly associated with the spirit of a dead person appearing in non-corporeal forms. Appearances by extraterrestrial entitities of various forms would strongly indicate that they are other living beings existing on other planets/galaxies, not deceased bodies revealing themselves through shy manifestations, particularly because their non-corporeal status would suggest that they'd be able to defy the reactions of the people who spot them and make their presence felt much more and umistakingly. I have a hard time believing that a ghost's sole function is that of making an occasional appearance and engage in particularly negative, positive or just useless activity in enviroments that almost always separate them to a large degree from humans. The existence of extraterrestrial life, though, I don't find hard to believe because with so much space and matter existing beyond this planet it's much easier to at least admit without proof that we are not the only ones here.
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