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Key topics in Physical cosmology Universe · Big Bang Age of the universe Timeline of the Big Bang 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 Ultimate fate of the universe Future of an expanding universe Lambda-CDM model Dark energy · Dark matter Dark fluid · Dark flow Timeline of cosmological theories History of the Big Bang theory Discovery of cosmic microwave background radiation Observational cosmology 2dF · SDSS COBE · BOOMERanG · WMAP · Planck Isaac Newton · Einstein · Hawking · Friedman Lemaître · Hubble · Penzias · Wilson Gamow · Dicke · Zel'dovich · Mather Rubin · Smoot · others   Astronomy Portal Category v t e 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 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", "dual dimension", "interpenetrating dimensions", "parallel dimensions", "parallel worlds", "alternative realities", "alternative timelines", and "dimensional planes," among others. Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
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