B From where is the universe expanding?

AI Thread Summary
The universe is expanding uniformly, with no defined center or edges. This expansion is characterized by an intrinsic increase in distances between objects rather than a movement from a specific point. The concept of a stable center is dismissed, as the universe's expansion is ongoing and dynamic. Additional insights on this topic can be found in the linked resource discussing the Friedmann equation. Understanding these principles is crucial for grasping the nature of cosmic expansion.
Odette
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Is it expanding from the edges?
Or from the center?
 
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As far as we can tell there is no center nor any edges. The expansion is an intrinsic increase in distances between objects.
 
Orodruin said:
As far as we can tell there is no center nor any edges.
At all? Or not stable because of the constant expansion of it?
 
At all.
 
@Odette I recommend the link in my signature
 
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https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New Brunswick campus. Here is an excerpt: Computer modeling of the gravitational lens by Keeton and Eid showed that the four visible foreground galaxies causing the gravitational bending couldn’t explain the details of the five-image pattern. Only with the addition of a large, invisible mass, in this case, a dark matter halo, could the model match the observations...
Hi, I’m pretty new to cosmology and I’m trying to get my head around the Big Bang and the potential infinite extent of the universe as a whole. There’s lots of misleading info out there but this forum and a few others have helped me and I just wanted to check I have the right idea. The Big Bang was the creation of space and time. At this instant t=0 space was infinite in size but the scale factor was zero. I’m picturing it (hopefully correctly) like an excel spreadsheet with infinite...

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