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      • 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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      What Is the Big Bang? | NASA Space Place – NASA Science for Kids

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

    Aug 21, 2024 · What Is the Big Bang? 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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  5. www.space.com › 25126-What is the Big Bang Theory? | Space

    Jul 26, 2023 · The Big Bang Theory explains how the universe began with an infinitely hot and dense single point that inflated to form the ever-expanding cosmos we see today.

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  7. 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] The notion of an expanding universe was first scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations .

  8. 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.

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

    Jul 29, 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.

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  10. www.sciencealert.com › big-bangWhat Is The Big Bang? - ScienceAlert

    The Big Bang is a theory describing the expansion of our Universe from a point of origin roughly 13.8 billion years ago. This hypothetical starting point of everything was an infinite concentration of energy referred to as a singularity.

  11. www.astronomy.com › science › the-science-behind-theThe 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. An end-on view of one...

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