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Lucifuge Rofocale
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A significant number of physicists today postulate that the universe we reside in is infinite in size. It's also thought that if we extrapolate back in time to the big bang that the universe was a singularity of infinite density. Singularities are commonly thought of as a dimensionless point, therefore, how can the universe exist as a dimensionless point with no spatial extent and then a fraction of a second later extend to infinite in 3 dimensions.