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Published online by Cambridge University Press: 04 August 2017
If the universe is spatially closed, and the simplest cosmological models are valid approximations, then in ∼ 1011 years the universe will recollapse into an antibang. (A “bang” is explosive, whereas an “antibag” may be considered implosive.) In this note I shall add one or two details to the seminal work of Rees (1969).