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  1. 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".

  2. 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.

    • The Editors of Encyclopaedia Britannica

  3. Images

    • What Caused the Big Bang? | Wonderopolis
    • Apologetics Press - The Big Bang Theory—A Scientific Critique [Part II ...
    • What Is A Singularity? - Universe Today
    • The Big Bang Theory Science Explosion - Seguroce

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  4. 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.

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

    Jun 13, 2024 · The Short Answer: 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!

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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.bbc.com › future › articleBig Bang: How the Universe was created - BBC

    Aug 12, 2014 · If the Big Bang theory is true, how did it lead to all the planets, stars and galaxies we can see today? Thanks to a series of calculations, observations from telescopes on Earth and probes...

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

    Dec 18, 2023 · Evidence of the Big Bang theory and what happened immediately after the expansion. By Astronomy Staff | Published: December 18, 2023 | Last updated on December 20, 2023