Indeed it's not entirely impossible based on current cosmological knowledge (despite some regulars insisting it is ) that the universe is spatially infinite in scope. Normally this is explained as Ned Wright does in the above link provided by speedfreek.
Originally Posted by noncryptic
It is I think correct to say that we know for pretty dang certain that our observable universe originated in "single point" (singularity or not) of the Big Bang event, as most likely did a fairly large amount of more of the essentially same (sometimes known as "the uniform patch"). But as to if this inflation bubble was actually the origin of the entire universe or not, and if it was all there was at the time of the event or not, the answer must currently be a firm "dunno". Obviously there are many ideas regarding the issue but so far none of them appears to be entirely conclusive.
Would it not be more accurate to say that the observable
universe (being finite in expanse) originated from a single (very small, singularity-like) point, and the entire
(infinitely large) universe originated not from a point but from an infinitely large 'primordial universe' that has the same properties as a singularity-like point wrt density (but not wrt size)?
The dog, the dog, he's at it again!