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The Big Freeze scares the hell out of me. It almost certainly won't happen in my lifetime, unless scientists everywhere are wrong, but it still scares me. There have been days where I just looked up universe-ending theories, and while fun, they creep me out, make me wonder, and make me worry. For no logical reason.
Perhaps yours is the most rational fear. Freeman Dyson's 1979 paper Time Without End: Physics and Biology in an Open Universe gave me the willies when I first encountered it, but also had some reassuring words of comfort for those who consider the long game.