True nothing? One final all-encompassing element or molecule? Same as before the big bang?
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The current best guess is that everything will get trivially close to absolute zero (but not actually reach it, because energy cannot be destroyed, so it will just be evenly distributed among everything). But maybe it will collapse, after which there may be a new Big Bang on a new universe. Or maybe time is cyclical, and the universe will replay itself infinitely. It’s not the kind of thing there can be a definitive answer to unless we somehow manage to observe it – perhaps at a cafe with cows who volunteer to be eaten.
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