i thought this a humorous explanation,
Quote:
The Big Bang theory envisions the universe beginning from a singularity - a mathematical concept of infinite temperature and infinite density packed into a single point of space. But scientists don't think this is what actually happened.
"It wouldn't really be infinite," explained physicist Paul Steinhardt, director of the Princeton Center for Theoretical Science at Princeton University in Princeton, N.J., and another architect of inflation. "Infinity just means a mathematical breakdown. It's a statement that you shouldn't have extrapolated your equations back that far because they just blew up in your face."
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The Big Bang: Solid Theory, But Mysteries Remain