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rogerg (Roger), I looked at your links.
Found them very interesting.
The first link has a section "Where is the Centre of the Universe ?
It states ...
It is less well known that Lemaître found a more general class of solutions which describe a spherically symmetrical expanding universe. These solutions, now known as Lemaître-Tolman-Bondi (LTB) models describe possible forms for the universe which could have a centre.
... although the standard big bang models describe an expanding universe with no centre, and this is consistent with all observations, there is still a possibility that these models are not accurate on scales larger than we can observe. Our ignorance about the real answer to the question "Where is the centre of the universe?" is complete.
I think things have just got a whole lot more complicated!
Thanks, Rob
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