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Multiverse
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Physical cosmology
Universe · Big Bang
Age of the universe
Timeline of the Big Bang
Ultimate fate of the universe
Inflation · Nucleosynthesis
GWB · Neutrino background
Cosmic microwave background
Redshift · Hubble's law
Metric expansion of space
Friedmann equations
FLRW metric
Shape of the universe
Structure formation
Reionization
Galaxy formation
Large-scale structure
Galaxy filament
Lambda-CDM model
Dark energy · Dark matter
Dark fluid · Dark flow
Timeline of cosmological theories
Future of an expanding universe
Observational cosmology
2dF · SDSS
COBE · BOOMERanG · WMAP · Planck
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The multiverse (or meta-universe, metaverse) 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 and constants that describe them. The term was coined in 1895 by the American philosopher and psychologist William James. 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. Multiverses 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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