"So how or where was all the matter contained that sprewed forth from that exploding marble.? How is it possible something so small contain so much?"
Good question, and the answer is we really don't know yet. We have some good, but untested, models of the earliest phase of the universe, but nothing definitive yet. The culprit is that pesky thing gravity which is so weak we haven't been able to find its particle in the lab yet. The leading model is the singularity model, but as any good mathemetician will tell you, an infinity usually signals a breakdown in the model you are using.
Chrome
"Recollect me darlin, raise me to your lips, two undernourished egos, four rotating hips"