Definition
The multiverse is the hypothetical set of all universes. Together, these universes are presumed to comprise everything that exists: the entirety of space, time, matter, energy, information, and the physical laws and constants that describe them. The different universes within the multiverse are called "parallel universes", "flat universes", "other universes", "alternate universes", "multiple universes", "plane universes", "parent and child universes", "many universes", or "many worlds". One common assumption is that the multiverse is a "patchwork quilt of separate universes all bound by the same laws of physics."
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DickeRobert Woodrow WilsonRoger PenroseRomanian science fictionRubber scienceRussian science fiction and fantasyRyu–Takayanagi conjectureSFERA AwardSabine HossenfelderSaturn AwardsSchrödinger's catScience-fiction fanzineScience (TV network)Science Fiction & Fantasy Translation AwardsScience and technology studiesScience fantasyScience fictionScience fiction comedyScience fiction comicsScience fiction conventionScience fiction fandomScience fiction filmScience fiction films in IndiaScience fiction libraries and museumsScience fiction magazineScience fiction on televisionScience fiction operaScience fiction studiesScience fiction theatreScientific AmericanScientific journalScientific romanceSean M. CarrollSeiun AwardSelection biasSelf-fulfilling prophecySelf-replicating machines in fictionSemiclassical gravitySense of wonderSerbian science fictionSet (mathematics)Set theorySex and sexuality in speculative fictionShape of the universeSidewise Award for Alternate HistorySimulated consciousness in fictionSimulated realitySir Julius Vogel AwardSloan Digital Sky SurveySocial science fictionSoft science fictionSolarpunkSpaceSpace-timeSpace WesternSpace operaSpace stations and habitats in fictionSpace travel in science fictionSpace warfare in science fictionSpacetimeSpanish science fictionSpeculative fictionSpin foamSpontaneous symmetry breakingSpy-Fi (subgenre)Stargate (device)Stars in fictionStatistical ensemble (mathematical physics)Statistical significanceSteampunkStellar engineStephen HawkingString landscapeString theoryString theory landscapeStructure formationSunburst AwardSuper-string theorySuperfluid vacuum theorySupergravitySuperhero fictionSuperhumansSupernatural fictionSuperstring theorySword and planetSymbiosis in fictionTBD Science Fiction Story AwardTachyons in fictionTaxonomy (general)Tech noirTechno-thrillerTechnology and societyTeleportation in fictionTempleton FoundationTemporal paradoxTerraforming in popular cultureTestabilityThe GuardianThe New York TimesThe Time MachineThe chicken or the eggTheodore Sturgeon AwardTheoretical physicistTheoretical physicsTheory of everythingTimeTime in physicsTime loopTime machineTime reversal symmetryTime travelTime travel in fictionTime viewerTimeline of cosmological theoriesTimeline of science fictionTipler cylinderTipler time machineTokusatsuTopological quantum field theoryTopopolisToy modelTrans-Planckian problemTranshumanism in fictionTwin Earth thought experimentTwistor theoryTähtivaeltaja AwardU.S. television science fictionUSA TodayUltimate ensembleUltimate fate of the universeUndecidable problemUniversal wavefunctionUniverseUnruh effectUplift (science fiction)Urania AwardUtopian and dystopian fictionVan Stockum dustVera RubinViatcheslav MukhanovWarp driveWavefunction collapseWeak anthropic principleWeapons in science fictionWeinberg–Witten theoremWeird fictionWell-definedWheeler–DeWitt equationWheeler–Feynman time-symmetric theoryWhite holeWilkinson Microwave Anisotropy ProbeWillem de SitterWilliam JamesWilliam R. 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