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[Phys-L] cosmology

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?



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