Just a simple statement of obviousness ...
If the 'universe' actually does bend back on itself so there really is no 'edge' defining it's limit, then one has a priori proclaimed/established that there can be no such thing as 'other universes', because, per argument, the one universe we live in is everything there is, it is unlimited, infinite - the lack of an 'edge' 'proves' it.
QED
Now, chew on that one fur a few milliparsecs, afore goin on another tang-end.
The universe is one giant mobius strip.

Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good ...