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  1. www.space.com › 25126-What is the Big Bang Theory? | Space

    Jul 26, 2023 · The Big Bang Theory is the leading explanation for how the universe began.

    • Killed The Pigeons

      Robert Wilson and Arno Penzias were using a large horn...

    • Cosmic Anniversary

      The landmark find put the Big Bang theory on solid ground,...

    • Infographic

      An early rival to the Big Bang theory, Steady State posits...

    • Images

      NASA . The Big Bang theory proposes that the universe began...

    • What Came Before The Big Bang

      For a general overview of the Big Bang theory, check out...

    • Did

      Bringing the story back to "The Big Bang Theory" episode, a...

    • Multiverse

      The multiverse. If we define "universe" as "all there is" or...

    • Planck Satellite

      The European Planck Space Observatory revealed the universe...

  2. en.wikipedia.org › wiki › Big_BangBig Bang - Wikipedia

    The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] . It was first proposed as a physical theory in 1931 by Roman Catholic priest and physicist Georges Lemaître when he suggested the universe emerged from a "primeval atom".

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  4. www.britannica.com › science › big-bang-modelBig-bang model | Definition, Evidence, Videos, & Facts

    Jun 18, 2024 · Big-bang model, widely held theory of the evolution of the universe. Its essential feature is the emergence of the universe from a state of extremely high temperature and density—the so-called big bang that occurred 13.8 billion years ago. Learn more about the big-bang model in this article.

  5. spaceplace.nasa.gov › big-bang › enWhat Is the Big Bang? | NASA Space Place – NASA Science for Kids

    Jun 13, 2024 · The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching!

  6. Images

    • Let's Talk Physics: The Big Bang Theory: Birth of the Cosmos
    • What Is A Singularity? - Universe Today
    • The Big Bang Theory Science Explosion - Seguroce
    • Big Bang Theory Science Quotes. QuotesGram

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  7. science.nasa.gov › universe › the-big-bangThe Big Bang - NASA Science

    The Big Bang - NASA Science. Explore Cosmic History. Study how the universe evolved, learn about the fundamental forces , and discover what the cosmos is made of. Overview. The origin, evolution, and nature of the universe have fascinated and confounded humankind for centuries.

  8. www.astronomy.com › the-science-behind-the-big-bang-theoryThe science behind the Big Bang theory | Astronomy.com

    Dec 18, 2023 · Learn how astronomers discovered the Big Bang and what happened after the explosion. Explore the evidence, the cosmic background radiation, the dark ages, and the fate of the universe.

  9. hubblesite.org › contents › articlesThe Big Bang | HubbleSite

    Sep 30, 2022 · Learn about the big bang, the event that created the universe 13.8 billion years ago. Find out how scientists measure the expansion rate of the universe and what it reveals about its age and history.