Because the energy of the "explosion" forced it outwards. The universe is explanding still today at an accelerated rate (it is getting faster) and it is thought to be due to dark energy.
But technically the resulting amount of mass and gravity would cause a black hole.
So is progressive Christianity basically Buddhism but you believe in Jesus instead of Buddha?
Some still think it will, but not for a very long time, after all it was a BIG bang :p then again, since the universes expantion is speeding up that may not happen. Being that knowledge of physics relating to matter and absolute nothing are almost non-existent for now after all, it isnt all that surpesing we aint figured out how its doing what its doing yet.
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