Related topics: galaxies · dark energy · big bang · dark matter · black holes

Do 'bouncing universes' have a beginning?

In trying to understand the nature of the cosmos, some theorists propose that the universe expands and contracts in endless cycles.

Stephen Hawking: Master of the multiverse

The multiverse challenges science as we know it, and Hawking wasn't pleased with it. But our journey to the edges of time has since reshaped our vision of the cosmos, and ourselves.

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