The multiverse (or meta-universe)
is the hypothetical set of multiple possible universes (including
the historical universe we consistently experience) that together comprise
everything that exists and can exist: the entirety of space, time, matter, and energy as well
as the physical laws andconstants that
describe them. The term was coined in 1895 by the American philosopher and
psychologist William James.[1] The
various 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. Multiple universes
have been hypothesized in cosmology, physics, astronomy, religion, philosophy,transpersonal psychology and fiction,
particularly in science fiction and fantasy. In these
contexts, parallel universes are also called "alternative universes",
"quantum universes", "interpenetrating dimensions",
"parallel dimensions", "parallel worlds", "alternative
realities", "alternative timelines", and "dimensional
planes," among others.
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