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There are several different guesses (I hesitate to dignify these with the word "theory", which implies that there is at least some observational data to back them up) as to the eventual fate of the universe. These guesses change on a year-by-year basis.

The idea that the "universe" may have an end is a relatively new one; the entire "big bang theory" of the origin of the universe is only 55 or so years old. Before that, the predominant idea was that the universe had existed forever, and would continue to exist forever.

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14y ago

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