🚀 go-pugleaf

> From one of Ethan Vishniac's postings:
> 
> > The flatness problem makes everyone uncomfortable...
> 
> The mention of hyperspherical models made me wonder how we know that
> the universe really is as extensive as the distance computed from
> highly red-shifted objects suggests.
> In particular, how do we know that the univers is not (relatively)
> small with a topology that permits closed geodesics.
> In this case, highly red-shifted light has just looped the loop
> a couple of times, which would allow the entire universe to be in
> communication.
> This would have interesting consequences. For instance, certain
> object would represent earlier stages of our own galaxy if we knew
> where to look.
> I have never heard this notion discussed.
> Does anyone know what (if anything) eliminates such a model??
> Please reply to the net.
> 
> 
> Randal Nelson

I don't know much about this but a starting point for references might be
"The Large Scale Structure of Spacetime" by Hawking & Ellis

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