If the universe inflated to 100 billion km in its first second, that suggests only 1/160,000 of it was observable from any point at that moment. The expansion rate slowed after that, of course, but could we do a similar calculation based on what we know of the expansion rate over time, and estimate the size of the whole universe as a multiple of the portion we can see?
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2why would the size of "the whole universe" be finite? – ACuriousMind Jan 15 '23 at 13:55
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1The Big Bang did not happen at a point from which the universe expanded outwards. – John Rennie Jan 15 '23 at 15:31
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1Oh, I thought we had some way to determine the size of the whole universe based on this Kurzgesagt video. Is the video mistaken? "The universe, which has grown to 100 billion kilometers..." I know the Big Bang didn't happen at a point, and that space isn't expanding "into" anything. https://youtu.be/wNDGgL73ihY?t=191 – Doradus Jan 16 '23 at 12:29