They are the biggest questions that science can possibly ask: Where did everything in our universe come from? How did it all begin?

CLICK HERE TO SEE PARTS 3-6 BBC Horizon 2010 takes the ultimate trip into the unknown, to explore a dizzying world of cosmic bounces, rips and multiple universes, and finds out what happened before the big bang. -->

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For nearly a hundred years, we thought we had the answer: a big bang some 14 billion years ago. But now some scientists believe that was not really the beginning. Our universe may have had a life before this violent moment of creation.

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