johnnydoom Human science is so young it barely exists in the grand scheme of the universe. We have made incredible progress, but we don't really have a grasp on gravity yet - we know it's there, apple falling on the head and whatnot, but we can't really explain it yet.
If you're asking me, I think the "big bang" is a perpetual cycle. Because of gravity, things tend to end up together. With no opposing forces in play, all matter/energy would converge. Even a human body, or a pinecone has gravity. The point from which all things came was probably the most densely that all of existence could be pulled together. What caused it to "burst" from that point remains a mystery.
Once all of existence was compressed into that single point it would seem as if nothing had existed before it - all of the evidence is washed away. As humans it is extremely difficult to imagine existence compressed into the size of a needlepoint - what "space" does the needlepoint reside in? What "space" does it expand into? These are the wrong questions, but our minds are trapped inside the three (or four) dimensions.
It's neat to think about. As organic lifeforms with a flash of time to exist and then disappear, I don't know that there's much to be gained by devoting one's life to finding these answers. I thought about doing just that, but I decided that having the answers didn't necessarily mean a happy life. Puppies are a greater source of human happiness than unlocking the mysteries of the universe.