On page 21 Hartle asserts that at the BB, "the whole of the observable universe today was compressed to the smallest possible volume." He's considered authoritative on General Relativity. I wonder; why do some experts think the universe decreases in volume as we go back in time, but others, such as Penrose (according to Quentin), believe in an always infinite universe where the average distance between galaxies decreases as we back in time? AG
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