Hello all, this is my first post here. I'm about as literate in physics as an ant is literate in algebra, but I was wondering if this theory about the big bang that popped into my head can stand on its own. (I'm doubt I'm the first person to ask this by any means, but I suppose it gives me a chance to introduce myself.) My theory is that if the big bang caused space itself to expand rather than just an expansion of matter from a central point within space (as I've come to understand), and if the universe "wraps around" on itself in such a way that you could go in one direction from one point and arrive at that same point again (as I've come to understand), that could potentially entail that whatever force that caused the universe to expand could be extradimensional. If we look at the universe as a four dimensional hypersphere, where the three dimensions that we know (length, depth and height) comprise the surface of that 4D sphere (much like how the surface of a balloon could be inferred as "two dimensional" in a sense,) perhaps some sort of "explosion" occurred in the fourth dimension, beneath our little three dimensional membrane wrapped around a hypersphere, causing space itself to expand? Of course we'd need an explanation for the origin of this little membrane, too. So how much of a fool am I making of myself?