The universe is a closed Space-time continuum that is expanding at an accelerating rate. The surface of this 4sphere or hypersphere is Einstein's space-time continuum. The space-time contiuuum curves back on itself in the 4th dimension.
you remind me of Hawking and his book , and it's hard to give a clear picture of 4shpere, which is a kind of a changing 3sphere with time, i guess, and it is not far from classical view, what new conclusions can you get from it?