Definition
The universe comprises all of existence: all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments. Since the early 20th century, the field of cosmology establishes that space and time emerged together at the Big Bang 13.787±0.020 billion years ago and that the universe has been expanding since then. The observable portion of the universe is approximately 93 billion light-years in diameter at present. The total size of the universe is not known.
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PooleCharles W. MisnerChemical elementChemical propertyChemistryChinaChristiaan HuygensChristian philosophyChristianityChronology of the universeCiceroClara MoskowitzClassical Mechanics (Goldstein)Classical elementsClaude Cohen-TannoudjiClimateCloudCoatlicueCold dark matterCometCommon EraComoving distanceComposite particleCopernican heliocentrismCopernican principleCosmic Background ExplorerCosmic CalendarCosmic EyeCosmic ViewCosmic Voyage (1996 film)Cosmic ZoomCosmic background radiationCosmic distance ladderCosmic inflationCosmic latteCosmic microwave backgroundCosmic neutrino backgroundCosmic rayCosmogonyCosmological constantCosmological phase transitionCosmological principleCosmological redshiftCosmologyCosmosCourse of Theoretical PhysicsCreation mythCreationismCritical Mass Density of the UniverseDark-energy-dominated eraDark Energy SurveyDark energyDark fluidDark matterDavid L. 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ZaltaEdwin HubbleEinstein field equationsElectric chargeElectromagnetic forceElectromagnetic radiationElectromagnetic spectrumElectromagnetismElectronElectroweak epochElectroweak interactionElementary particleElizabeth GibneyEmpedoclesEmpirical evidenceEmpirical researchEncyclopædia BritannicaEnd of GreatnessEnergyEnergy densityEnglish languageEnneadEnuma ElishEpic poetryEternal inflationEudoxus of CnidosEukaryoteEuropean Space AgencyEvent (relativity)Evgeny LifshitzEvolution of fungiEvolutionary history of plantsExistenceExpansion of the universeExtraterrestrial lifeFahrenheitFalse vacuumFaunaFermi paradoxFermionic condensateField (physics)Fifth forceFilament (cosmology)Fine-tuned universeFinnish peopleFire (classical element)Flammarion engravingFlat EarthFloraForbesForceForce carrierFormation and evolution of the Solar SystemFourier seriesFractalFriedmann equationFriedmann equationsFriedmann–Lemaître–Robertson–Walker metricFundamental interactionFundamental interactionsFungusFuture of EarthFuture of an expanding universeGaia (mythology)Gaia hypothesisGalaxyGalaxy And Mass Assembly surveyGalaxy clusterGalaxy filamentGalaxy formation and evolutionGalaxy groups and clustersGalileo GalileiGasGeneral relativityGeneral theory of relativityGenesis creation narrativeGeocentric modelGeological history of EarthGeological history of oxygenGeologyGeometryGeorge F. R. EllisGeorge Francis Rayner EllisGeorge GamowGeorge SartonGeorge SmootGeorges LemaîtreGerman languageGlossary of physicsGluonGod (male deity)God in Abrahamic religionsGoddessGoogolplexGould BeltGrand unification epochGravitationGravitation (book)GravitationalGravitational wave backgroundGravityGreek astronomyHD1 (galaxy)HadronHadron epochHalf-integer spinHannah DevlinHannes AlfvénHarvard University PressHeatHeat death of the universeHeinrich Wilhelm Matthäus OlbersHeliocentrismHeliumHellenistic astronomerHenry GravrandHeraclides PonticusHeraclitusHerbert GoldsteinHiggs bosonHigh energy physicsHindu cosmologyHistory of EarthHistory of IndiaHistory of astronomyHistory of lifeHistory of the Big Bang theoryHomogeneity (physics)Hooker TelescopeHossein NasrHot dark matterHubble's lawHubble Space TelescopeHubble Ultra-Deep FieldHubble constantHubble volumeHumanHydrogenIllustris projectImmanenceImmanuel KantIndian philosophyInflation (cosmology)Intergalactic mediumIntergalactic spaceInternal structure of EarthInternet Encyclopedia of PhilosophyInterstellar mediumIonIsaac NewtonIslamIslamic astronomyIslamic cosmologyIsotopeIsotropicIsotropyIzanagiIzanamiJa'far ibn Muhammad Abu Ma'shar al-BalkhiJainismJapanese mythologyJean-Philippe de CheseauxJean-Philippe de ChéseauxJean-Pierre LuminetJeans instabilityJewish philosophyJohann Heinrich LambertJohannes KeplerJohn Archibald WheelerJohn C. 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GoodsteinJürgen EhlersKalamKalevalaKanada (philosopher)KelvinKip ThorneLambda-CDM modelLaniakea SuperclusterLarge-scale structure of the cosmosLarge quasar groupLatinLeptonLepton epochLeucippusLev LandauLifeLife in the universeLightLight-yearLiquidList of cosmologistsList of creation mythsLithiumLiveScienceLive ScienceLocal (astronomy)Local BubbleLocal GroupLocal HoleLocal Interstellar CloudLocal SheetLocal VolumeLocation of EarthLogarithmic scaleLogosLorentz transformationLucio RussoMacroscopic scaleMammalMany-worlds interpretationMarc AaronsonMario LivioMassachusetts Institute of TechnologyMass–energy equivalenceMatt StrasslerMatterMatter-dominated eraMax Planck Institute for AstrophysicsMax TegmarkMeasurement uncertaintyMesonMesopotamiaMetallicityMeteorologyMetric (general relativity)Microscopic scaleMicrowaveMiddle AgesMilky WayMinkowski spaceModern physicsModuli (physics)MomentumMonotonicMonthly Notices of the Royal Astronomical SocietyMoonMoonlightMulticellular organismMultiverseMuonMāori mythologyN. David MerminNGC 188Nabila AghanimNasīr al-Dīn al-TūsīNatural environmentNatural lawNatural philosophyNatural satelliteNatureNature-based solutionsNature (journal)NebulaNeutrinoNeutrinosNeutronNewton's law of universal gravitationNewton's laws of motionNial TanvirNicholas B. SuntzeffNicholas of CusaNicolaus CopernicusNon-standard cosmologyNorse mythologyNorth-Holland Publishing CompanyNousNuclear forceNuclear fusionNucleocosmochronologyNumberObservable universeObservational cosmologyOceanOlbers' paradoxOld FrenchOmega CentauriOpacity (optics)Ophiuchus SuperclusterOrder of magnitudeOrganismOrion ArmOtto E. NeugebauerPanguPantheismParallel universe (fiction)ParmenidesParsecParsecsParticleParticle acceleratorParticle horizonParticle physicsPauli exclusion principlePenguin GroupPhase (matter)Phase transitionPhilolausPhilosophical Transactions of the Royal Society APhilosophiæ Naturalis Principia MathematicaPhilosophyPhilosophy of physicsPhilosophy of space and timePhotinoPhotonPhoton decouplingPhoton epochPhysical constantPhysical cosmologyPhysicsPhysics (Aristotle)Physics EducationPionPisces–Cetus Supercluster ComplexPlanck (spacecraft)Planck epochPlanetPlantPlasma (physics)Plate tectonicsPlatoPlatonic solidsPopulation IIIPositroniumPowers of Ten (film series)PrakrtiPre-Socratic philosophyProkaryoteProtistProtonPtolemyPythagorasPythagoreansQuantumQuantum mechanicsQuarkQuark epochQuark–gluon plasmaQuasarQuintessence (physics)Radcliffe WaveRadiationRadiation-dominated eraRainRalph AlpherRangi and PapaRare Earth hypothesisRashid SunyaevReasoningRecombination (cosmology)RedshiftReionizationReligionReligious cosmologyReligious interpretations of the Big Bang theoryRest massRetrograde and prograde motionRichard C. TolmanRobert H. DickeRobert Woodrow WilsonRoger PenroseRuth DurrerSaadia GaonSamkhyaSandSatellite galaxies of the Milky WaySaul PerlmutterScalar fieldScale factor (cosmology)Scale factor cosmologyScientific AmericanScientific ReportsScientific RevolutionScientistSean M. CarrollSeleucus of SeleuciaSerer creation mythSerer peopleSet (mathematics)Sexual reproductionShape of the universeShapley SuperclusterSloan Digital Sky SurveySnowSoap bubbleSolar SystemSolidSolutions of the Einstein field equationsSpaceSpace-likeSpace and survivalSpace and timeSpacetimeSpecial relativitySpecial theory of relativitySpeed of lightSpringer (publisher)Standard ModelStandard Model of particle physicsStandard modelStanford Encyclopedia of PhilosophyStarState University of New York PressState of matterStellar nucleosynthesisStellar parallaxStellar populationStephen HawkingSteven FrautschiStobaeusStraboStrong forceStrong interactionStrong nuclear forceStructure formationSub-atomic particlesSubatomic particleSunSunlightSuperclusterSupermassive black holeSupernova nucleosynthesisTalkOrigins ArchiveTau (particle)Taylor & FrancisTemporal finitismTensor calculusTerasecond and longerThalesThe Astrophysical JournalThe Hidden RealityThe Mechanical UniverseThe Sand ReckonerThe Stanford Encyclopedia of PhilosophyTheologyTheoretical physicsTheory of everythingThermal equilibriumThomas DiggesThomas Heath (classicist)TiamatTibetan BuddhismTideTimeTime in physicsTimeline of astronomyTimeline of cosmological theoriesTimeline of the early universeTimeline of the evolutionary history of lifeTimeline of the far futureTimeline of the near futureTimeline of the universeTo the Moon and BeyondTom M. ApostolTornadoTorusTriangulum NebulaTropical cycloneTruthType Ia supernovaUdayanaUltimate fate of the universeUnitarityUniverse (disambiguation)University of TexasUniversität Frankfurt am MainUp quarksVacuumVacuum energyVaisheshikaVera RubinVertebrateVirgo SuperclusterVirusVoid (astronomy)Vācaspati MiśraW and Z bosonsWaterWater (classical element)WaveWavelengthWave–particle dualityWeak interactionWeak nuclear forceWeatherWestern worldWildernessWildfireWilkinson Microwave Anisotropy ProbeWill DurantWillem de SitterWindWolfgang RindlerWorldWorld (philosophy)World eggWorld lineYakov ZeldovichYmirYvonne Choquet-BruhatYvonne Dold-SamploniusZeno's paradoxesZeno of EleaZero-energy universe
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