I mean if I drop a rock into a lake, its makes circles and the outermost circles are the oldest. Or if I blow something up, the furthest debris is the oldest.
In: Physics
The responses you got so far are spot on and explain the subtle details of an expansion of the universe without a center with many examples.
I would like to add an explanation that is visual and has helped me to really understand what is going on:
[https://www.vttoth.com/CMS/physics-notes/359-why-cosmic-expansion-has-no-center](https://www.vttoth.com/CMS/physics-notes/359-why-cosmic-expansion-has-no-center)
Here you just have to align a picture with its “expanded” version and see for yourself that, whatever you do, it will seem like the expansion is moving outward of the center that you choose.
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