Light reflection from edge of universe

AI Thread Summary
The discussion centers on the concept of a boundary in the universe and its implications for light reflection and redshift. It suggests that if a boundary exists due to gravitational pull, light could slow down and return to us, potentially affecting our observations of distant stars. However, there is a strong counterargument stating that the universe has no edge or center, and any perceived boundaries are more akin to an event horizon. The conversation highlights the speculative nature of these ideas, with participants acknowledging the complexity of the topic. Ultimately, the discussion reflects ongoing debates about the universe's structure and the behavior of light within it.
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tif we presume that our finite universe has a boundry. This boundry is due to the pull of gravity. Light will slow down and then come back to us. 'i may be absolutely wrong in this'. My question is that the light we see will be from the stars surface that doesn't face us and star moving away from us as it hasnt reached the boundry yet. What will be the red shift value of this light.
 
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There is no boundary!
 
The universe has no edge or "center".
 
i guess it has event horizon that is like an edge
 
This is turning into speculation piling on more speculation.
 

Thread 'Matter density right after the decoupling'

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##.
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Thread 'Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".'

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...
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Thread 'Big Bang and Infinite Universe'

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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