Multiverse - Academic Kids
http://academickids.com/encyclopedia/index.php/Multiverse
The idea that the universe that we can observe is only part of the whole physical reality led to the definition of 'multiverse', the set of multiple possible universes. The term "multiverse" was coined in December 1960 , by Andy Nimmo , then vice chairman of the British Interplanetary Society , Scottish Branch, for a talk to the branch on the many-worlds interpretation of quantum physics which had been published in 1957.
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