Gawain here is a quote from The Fabric of the Cosmos , a sort of cosmology for dummies book by Brian Greene a professor at Columbia I believe.
So you won't get any scientific answers about your matter question. The big bang assumes a huge density of matter and energy at the time when space began to expand. This is the big bang, not some miraculous flash of energy into existence, but rather the evolution of mass and energy once it was in existence.A common misconception is that the big bang provides a theory of cosmic origins. It doesn't. The big bang is a theory...that delineates cosmic evolution from a split second after whatever happened to bring the universe into existence but it says nothing at all about time zero itself.
Edit:
Link to the same at NASA: http://map.gsfc.nasa.gov/m_uni/uni_101bb2.html
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