bruceralph

just had a quick look at the net to see if I could find an answer to the original question. In spacetime, it is currently believed that the universe could be saddleshaped (ie a hyperbola) where space curves back. It is a complicated testable hypothesis that is being worked on. In the larger scheme of the cosmos, though, I think it could be just a weird shaped bubble.

Its a good question to which I did'nt really have an answer. So I had a quick look at Wiki and the answer has partly to do with the idea that the photons we observe were not produced until a time after the expansion of the universe started following the big bang. It also is partly to do with the curvature of spacetime at cosmological distances.

I do have a new cosmology theory and it is published in my book. (google:"connect with planet earth"). It builds on current known science and I think it is a reasonable explanation how the cosmos developed.