General Theory
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The multiverse is the hypothetical set of infinite or finite possible universes (including the historical universe we experience) that together comprise everything that exists and can exist. The various universes within the multiverse are sometimes called parallel universes. The original relative state formulation is due to Hugh
Everett in 1957. The term Multiverse was invented in December 1960, by Andy Nimmo, then vice chairman of the British Interplanetary Society, Scottish Branch, for a talk on the Everett many-worlds interpretation of quantum physics which had been published in 1957, to the branch. This was given in February 1961, and the word with its original definition, “an apparent universe, a multiplicity of which, go to make up the whole universe” was then first used.