Artto
I think you're slightly misunderstanding the big bang theory. Similarly to evolutionary theory, the big bang theory doesn't describe the actual start of the universe, but rather the development of the universe from the
Planck time onward. This is because when we set time to 0, the equations describing the universe brake down (you get a lot of divisions by 0), that is why we don't know what was "going on"
before Planck time. It never describes any "steady state particle".
It also didn't really start from "a single particle that exploded". The size of the universe (the actual space), was so small, that all the matter (or rather energy, which then converted into matter) that exists was condensed into this very small spot (basicaly a point, the singularity), which expanded into the universe we know today (I'm no physicist, so if there are any horrible errors besides the oversimplification, please correct me).
We don't know the cause for it's existence, we don't know the cause of the expansion. If you like, you can put god in that gap, but personally I'm content with the "we don't know (yet)" answer.
Yeah, I suppose that is the best way to consider it all without going mad... Let's look at what we already know and expand on it from there.
I want to do everything backwards. I want to know everything now and work my way back to here and now. xp
... but I can't help wondering about what was beyond the outside of what was our beginnings. If there was a particle, my default question is, "What made the particle, and what was outside of it?... If we are talking about forever, my default for that is, "What happened before forever began?"
I know we drive you nuts Artto, but I think that is why we religious, God/spirit believing folk need you guys who can be content with just existing. LOL
I must confess that my mind just can't grasp infinity in any way. Try as I may, I can't, and it will probably be what drives me senile when I am older.