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  2. spaceplace.nasa.gov › big-bang › enWhat Is the Big Bang? - NASA Space Place

    May 6, 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!

  3. 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. Simply put, it says the universe as we know it started with an infinitely hot and dense single point that...

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

    The Big Bang was the early state of high density and temperature from which the universe expanded and cooled. [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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  6. www.britannica.com › science › big-bang-modelBig-bang model | Definition, Evidence, Videos, & Facts

    The big-bang model is the widely accepted theory of the origin and evolution of the universe from a hot and dense state 13.8 billion years ago. Learn about the history, assumptions, predictions, and discoveries of this theory from Britannica's editors and experts.

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  7. www.thoughtco.com › what-is-the-big-bang-theoryUnderstanding the Big-Bang Theory - ThoughtCo

    Jun 11, 2019 · Learn how the big-bang theory explains the origin and evolution of the universe, from its initial singularity to the present day. Explore the evidence, history, and controversies of this dominant cosmological model.

  8. www.nationalgeographic.com › science › articleOrigins of the universe, explained - National Geographic

    Jan 17, 2017 · Learn how the big bang theory describes the universe's origin from a single primordial atom to the present day. Explore the key events, discoveries, and mysteries of cosmic history.