what happenend?

If the big bang was this massive explosion, which due to cosmic
inflation, spread the universe, but my theory, is this: What starting
molecule or proton caused the big bang? Could it have been some atom
that split resulting in a massive explosion? If at first there was
nothing, then there was everything? How can so much matter come out of
nothing?
Also, if the big bang was so long ago, who was able at that time
period, to actually justify it happened? My theory is, there must've
been something that allowed the big bang to occur. It's common sense
that anything comes from SOMETHING! So what was it?

wrote in news:1173146862.754365.227400
@t69g2000cwt.googlegroups.com:

If the big bang was this massive explosion, which due to cosmic
inflation, spread the universe, but my theory, is this: What starting
molecule or proton caused the big bang?

Not an explosion.

http://www.astro.ucla.edu/~wright/cosmolog.htm

As to a cause. That is unknown. A speculation from string theory is the
ekpyrotic scenario.

http://www.physics.princeton.edu/~steinh/npr/

Could it have been some atom
that split resulting in a massive explosion? If at first there was
nothing, then there was everything? How can so much matter come out of
nothing?

The real question is why there is virtually no antimatter. See the faq at
the Ned Wrights cosmology link above.

Also, if the big bang was so long ago, who was able at that time
period, to actually justify it happened?

Deduction from evidence. Again see Ned Wright's tutorial.

My theory is, there must've
been something that allowed the big bang to occur. It's common sense
that anything comes from SOMETHING! So what was it?

Common sense isn't always correct.

Klazmon.