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If the expansion did have a beginning then we are faced with further questions: is this ‘beginning’ merely the start of the expansion of the Universe that we see today or is it the Beginning, in every sense, of the entire physical Universe?
— John Barrow (2000)
The Book of Nothing: Vacuums, Voids, and the Latest Ideas about the Origins of the Universe
Pantheon, p. 274
Pantheon, p. 274