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

    Jul 26, 2023 · The birth of the universe. Around 13.7 billion years ago, everything in the entire universe was condensed in an infinitesimally small singularity, a point of infinite denseness and heat....

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

    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.

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

    Independent of Friedmann's work, the Big Bang was first proposed in 1931 by Roman Catholic priest and physicist Georges Lemaître when he suggested the universe emerged from a "primeval atom". Various cosmological models of the Big Bang explain the evolution of the observable universe from the earliest known periods through its ...

  5. 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.

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    • The Big Bang & the Formation of the Universe - Maggie's Science Connection
    • Big Bang Theory - Our Universe - The Beginning Of The Space & Time
    • The Tangled History of Big Bang Science - Nautilus | Science Connected
    • Big Bang Theory: Evolution of Our Universe - Universe Today

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

    Sep 17, 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!

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

    Dec 18, 2023 · The first and most confident evidence we have came from 1964 when scientists at the Bell Labs discovered the cosmic microwave background radiation, confirming there was a Big Bang.

  10. www.livescience.com › 65700-big-bang-theoryThe Big Bang Theory: How the Universe Began - Live Science

    Jun 12, 2019 · The Big Bang theory describes how the universe began based on what cosmologists know about the sliver of existence visible today.

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