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

    Jul 26, 2023 · Learn about the leading explanation for how the universe started with an infinitely hot and dense single point that inflated and stretched over 13.7 billion years. Find out the evidence, the models, the FAQs and the alternative theories of the Big Bang.

    • Killed The Pigeons

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

    • Cosmic Anniversary

      The CMB is the oldest light in the universe, dating from the...

    • 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

      This would only be consistent with the big bang theory if...

    • Did

      They say that life imitates art, but the arrow goes both...

    • Multiverse

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

    • Planck Satellite

      This graphic illustrates the evolution of satellites...

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

    The Big Bang is a theory that describes how the universe expanded from an initial state of high density and temperature. It explains various observed phenomena, such as the abundance of light elements, the CMB, and large-scale structure, but also leaves some unexplained aspects, such as dark matter and dark energy.

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

    Learn about the widely held theory of the evolution of the universe from a state of extremely high temperature and density 13.8 billion years ago. Explore the history, assumptions, predictions, and evidence of the big-bang model with Britannica's articles, videos, and facts.

  5. Images

    • What Is A Singularity? - Universe Today
    • Timeline Of Big Bang Theory Graphic Organizer
    • Earth Science Astronomy - The big bang theory
    • Big Bang Theory

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

    Learn how the universe evolved from the Big Bang to the present day, and what the cosmos is made of. Explore stories, articles, and topics from NASA's cosmology experts and missions.

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

    Sep 17, 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!

  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 expansion. Explore the evidence, the cosmic background radiation, the dark ages, and the fate of the universe.

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

    Jun 12, 2019 · Learn about the history and evidence of the Big Bang theory, the leading explanation for the origin and evolution of the cosmos. Explore the challenges and controversies of the inflation model, the multiverse hypothesis and the cosmic microwave background.