Alternate universes
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The multiverse (or meta-universe [metaverse]) is the hypothetical set of multiple possible universes (including our universe) that together comprise everything that physically exists: the entirety of space and time, all forms of matter, energy and momentum, and the physical laws and constants that govern them. The different universes within the multiverse are sometimes called parallel universes. The structure of the multiverse, the nature of each universe within it and the relationship between the various constituent universes, depend on the specific multiverse hypothesis considered.
Multiverses have been hypothesized in cosmology, physics, astronomy, philosophy, transpersonal psychology and fiction, particularly in science fiction and fantasy. The specific term "multiverse" was coined in 1895 by psychologist William James.[1] In these contexts, parallel universes are also called "alternative universes", "quantum universes", "interpenetrating dimensions", "parallel worlds", "alternative realities", "alternative timelines", etc.
See main article on the Multiverse