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Time travel can result in multiple universes if a time traveller can change the past. In one interpretation, alternative histories as a result of time travel are not parallel universes: while multiple parallel universes can co-exist simultaneously, only one history or alternative history can exist at any one moment, as alternative history usually involves, in essence, overriding the original ...
Parallel universes in fiction, a hypothetical self-contained plane of existence, co-existing with one's own; Alternate history, a genre of fiction in which historical events differ from reality; Alternative universe (fan fiction), fiction by fan authors that departs from the fictional universe of the source work
This is an accepted version of this page This is the latest accepted revision, reviewed on 7 March 2025. Hypothetical group of multiple universes Not to be confused with Metaverse. "Multiverses" redirects here; not to be confused with MultiVersus. For other uses, see Multiverse (disambiguation). Part of a series on Physical cosmology Big Bang · Universe Age of the universe Chronology of the ...
Alternate reality (or Alternative reality, UK English) often refers to parallel universes in fiction, a self-contained separate world, universe or reality coexisting with the real world, which is used as a recurring plot point or setting used in fantasy and science fiction. Alternate reality may also refer to:
The Antimatter Universe: Post-Zero Hour: The Anti-Monitor, the Crime Syndicate of Amerika, [45] the Sinestro Corps, the Warlock of Ys, and the Weaponers of Qward: The Antimatter Universe is a "universe of evil". It survived the events of Crisis on Infinite Earths and Infinite Crisis and exists alongside the 52 positive-matter alternate universes.
The set of rational numbers is not complete. For example, the sequence (1; 1.4; 1.41; 1.414; 1.4142; 1.41421; ...), where each term adds a digit of the decimal expansion of the positive square root of 2, is Cauchy but it does not converge to a rational number (in the real numbers, in contrast, it converges to the positive square root of 2).
This type of alternative universe places two fictional universes in a situation where they interact, similar to reality swaps (which mix a fictional universe with the real world). [ citation needed ] Such stories sometimes involve "comparisons or conflict" between the combat prowess of the two universes, often involving the various strengths ...
The quantum-mechanical "Schrödinger's cat" paradox according to the many-worlds interpretation.In this interpretation, every quantum event is a branch point; the cat is both alive and dead, even before the box is opened, but the "alive" and "dead" cats are in different branches of the multiverse, both of which are equally real, but which do not interact with each other.