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Well if you think about it, if there is an afterlife which I am certain there is then it has to be remembered that if they are sentient and I believe they are then if there is a civilization here that those same entity's would be visiting it may not actually be us but our higher dimensional - spirit civilization which would arguably also be extremely far in advance of us as far as science is concerned, Einstein for example and of course all the other great thinkers would not be bound by time in there science pursuits.
(snip) . . . . indeed our own spirit's may be far more alien to us than ET's from half way across the physical universe.