Here is the Forbes show and tell on this topic: the diagram shows size vs age - with most superluminal expansion in the first instants.....Ask Ethan: How Large Is The Entire, Unobservable Universe?
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Ask Ethan: How Large Is The Entire, Unobservable Universe?
Ethan Siegel
If we know how big the observable Universe is, why can't we figure out how big the unobservable part is?
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On Friday, October 9, 2020, 11:17:18 AM CDT, Anthony Lapinski <alapinski@pds.org> wrote:
This came up in my astronomy class. So the big bang happened some 13.8 By
ago. I thought the size (radius) of the visible universe would be 13.8 Bly.
But after checking for an updated Hubble constant, I found the size
(radius) of the universe to be around 46 Bly. Is this due to the expansion
of the universe? How is this value determined? galaxy redshifts?