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@notquitereal i do not find that easy to think about. this is why after a certain point physicists just describe stuff using math & find it very difficult to relate stuff back to everyday terms.
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@notquitereal here is a nice article that largely confirms what i said (yes!!) curious.astro.cornell.edu/about-us/104-the-universe/cosmology-and-the-big-bang/expansion-of-the-universe/623-what-is-the-universe-expanding-into-intermediate