Home›Concepts›Big Bang TheoryConceptsBig Bang TheoryAlso Known As Big BangCitation FormatsGeneral ReferenceGeneral Reference Citation TextSpace and Astronomy Atlas. "Big Bang Theory." Accessed August 30, 2026. https://dev-space.interactiveatlas.org/concepts/big-bang-theory.Copy General ReferenceAPA StyleAPA Style Citation TextSpace and Astronomy Atlas. (n.d.). Big Bang Theory. Retrieved August 30, 2026, from https://dev-space.interactiveatlas.org/concepts/big-bang-theoryCopy APA StyleBibTeXBibTeX Citation Text@misc{spaceandastronomyatlas-big-bang-theory, author = {Space and Astronomy Atlas}, title = {Big Bang Theory}, year = {2026}, url = {https://dev-space.interactiveatlas.org/concepts/big-bang-theory}, note = {Accessed August 30, 2026} }Copy BibTeXReference and ClassificationDevelopingThe prevailing cosmological model describing the universe's expansion from an extremely hot, dense initial state roughly 13.8 billion years ago. It is supported by the observed redshift of distant galaxies, the cosmic microwave background radiation, and the relative abundance of light elements.FactsCross-Tradition ConnectionsSourcesTake a Related QuizComments (0)Reader Challenges (0 open reader challenges)FactsConcept DomainWell-attestedCosmology 1Formulated YearWell-attested1927 2Year Georges Lemaitre proposed an expanding universe; the name Big Bang was coined later by Fred Hoyle in 1949.Proposed ByWell-attestedGeorges Lemaitre 1Cross-Tradition ConnectionsAssociated WithCosmic Inflation, Concepts Well-attested Source Wikipedia (space and spaceflight articles)Cosmic Microwave Background, Concepts Well-attested ConnectedIts 1965 detection provided decisive evidence for the Big Bang model.Source Wikipedia (space and spaceflight articles)Cosmic Microwave Background, Concepts Well-attested Source Wikipedia (space and spaceflight articles)Cosmological Constant, Concepts Well-attested Source Wikipedia (space and spaceflight articles)Dark Energy, Concepts Well-attested Source Wikipedia (space and spaceflight articles)Dark Matter, Concepts Well-attested Source Wikipedia (space and spaceflight articles)Olbers' Paradox, Concepts Well-attested Source Wikipedia (space and spaceflight articles)Redshift, Concepts Well-attested ConnectedGalaxy redshifts are a principal line of evidence for the expanding universe the Big Bang model describes.Source Wikipedia (space and spaceflight articles)Redshift, Concepts Well-attested Source Wikipedia (space and spaceflight articles)Sources1. Wikipedia (space and spaceflight articles)Wikimedia FoundationBig Bang, lead sectionQuote, Big Bang, lead sectionThe Big Bang is a physical theory that describes how the universe expanded from1. Wikipedia (space and spaceflight articles)Wikimedia FoundationBig Bang, Before the name sectionQuote, Big Bang, Before the name sectionIn 1931, Lemaitre went further and suggested that the evident expansion1. Wikipedia (space and spaceflight articles)Wikimedia FoundationAssociated With: Cosmic Microwave Background1. Wikipedia (space and spaceflight articles)Wikimedia FoundationAssociated With: Redshift1. Wikipedia (space and spaceflight articles)Wikimedia FoundationAssociated With: Redshift1. Wikipedia (space and spaceflight articles)Wikimedia FoundationAssociated With: Cosmic Microwave Background1. Wikipedia (space and spaceflight articles)Wikimedia FoundationAssociated With: Dark Matter1. Wikipedia (space and spaceflight articles)Wikimedia FoundationAssociated With: Dark Energy1. Wikipedia (space and spaceflight articles)Wikimedia FoundationAssociated With: Cosmic Inflation1. Wikipedia (space and spaceflight articles)Wikimedia FoundationAssociated With: Cosmological Constant1. Wikipedia (space and spaceflight articles)Wikimedia FoundationAssociated With: Olbers' Paradox2. Encyclopedia Britannica: Space ExplorationEncyclopedia Britannica, Inc.Take a Related QuizSpace and Astronomy: Origins, Instruments and New FrontiersIncludes a question about Big Bang Theory.Orbital Mechanics and Cosmology ConceptsCovers this kind of entry.Comments (0)No comments yet. Be the first to share a thought.Sign in to join the discussion.Reader Challenges (0 open reader challenges)No disputes yet. Spotted an error or a better source? Open the first one.Sign in to dispute this or suggest a correction.View At A Past YearThe atlas records no dated fact of its own for this entry, so there is no other year to choose.Show This Year