If the Big Bang was as described, how come the Univese is homogenous. Why are the galazies and other matter not formed in the shape of a hollow sphere, much like the remnant of a supernova, (minus the stellar remnant at the centre)? The only explanation I can imagine is that the Big Bang was not an explosion of matter, but a sudden manifestation of space, and the big bang was in fact the sudden birth of space, with an integral property of expansion.