A Universal Cycle of birth and rebirth occurs every trillion years or so, according to one new cosmology based on String Theory. Big bangs result when two 10-dimensional "branes" collide and expand and then collide again. In this scenario, our universe marks just one phase in this infinite cycle.
A simpler summary:
Scientific American: String Theory revision of the recurring Big Bang
A lengthier, more technical summary:
Scientific American: A Recycled Universe
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