Cosmology and quantum physics both offer tantalizing possibilities that we inhabit just one reality among many. But testing ...

Parallel worlds sound like pure science fiction, but several major physics ideas keep pointing toward them. Quantum mechanics suggests reality may “split” into different outcomes, while cosmology ...

Doctor Strange in the Multiverse of Madness director Sam Raimi has confirmed that a third parallel reality was cut from the 2022 sequel, as was a major action sequence.

Pick up any science fiction book from the 1960s, and you’ll find parallel dimensions explained through magic portals or mysterious machines that work “just because.” Today’s readers want stories that ...