Probably critical mass, I'm guessing. If matter can't be created or destroyed, then it was packed in pretty tight, like a black hole. Which is actually the same amount of matter as inside a sun, just supercompressed to about the size of a pea, not a hole at all. :P
Here is my theory:
Billions and billions of years ago, before the Big Bang, the universe was probably very much the same is it is today. However, scientists believe that the universe is constantly expanding and contracting. Couple this with the most awesome force in the universe we know about, black holes, the thing proabably played out like this:
Universe formed by unknown event (Or a Big Bang)->
Universe continuously expands after said event, planets and stars form over billions of years.->
Universe hits the edge of its possible size and begins to contract.->
The continued contraction and the formation of massive black holes, the result of stars dying over time, forces all of the matter existing into one spot.->
The compressed matter then bounces outward after reaching critical mass, thus creating a second Big Bang.->
Process repeats.
This is to me, based on what I have learned from several scientific studies and many theories, a logical conclusion.
Imagine a bubble of air trapped in a marble filled with water. You have the air (matter) so tightly compressed by the water (space) that it must burst. Thus, it reaches critical mass, the maximum amount of pressure, and expands. Once it hits the edge of the marble, basic kinetic physics come into effect and it bounces off the edge of the marble back towards the center, where the water applies pressure once more. Process repeats.
I am just sharing my theory, I would like very much to hear others.
EDIT: I see you watching this thread, Mosier. Please post your theory.
Last edited by Mister616; Nov 1, 2008 at 07:07 PM.