A 13th-century bishop's theory about the formation of the universe has intriguing parallels with the theory of multiple universes.

A work to be published in the Physical Review D posits a test, and some interesting conclusions, for multiverse theory. Multiple, or alternate, universes might, less excitingly, be called 'very ...

Eternal chaotic inflation, which generates multiple universes, builds from the theory of cosmic inflation, originated by physicist Alan Guth at the Massachusetts Institute of Technology.

The increasingly popular theory of Many Worlds suggests every fundamental event has multiple possible outcomes and splits the world into various realities.

Before his death on March 14, theoretical physicist Stephen Hawking was deep in thought about the possibility of universes that exist well beyond our own — places with completely unknown ...

Just weeks before his death, Stephen Hawking had been working with theorist Thomas Hertog on research into multiple parallel universes, or a multiverse.

If the theory of parallel universes with multiple timelines is correct, time travel would be a possibility. The idea could mean that in some universes, the asteroid that killed the dinosaurs ...