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One has to suspend belief, of course, in order to enjoy Sci Fi.  e.g., in Star Trek, how did they NOT have problems syncing up, timewise, with the rest of their civilized universe?  (Considering time is relative, and they travelled at light speed frequently. Time should have been passing faster in the Federation planets and elsewhere, relative to those on the Enterprise.)  Or maybe there was an explanation for that, that I never heard.

(I figure the instant communication they had over so many light years could be chalked up to some sort of communication system based on entangled particles.)