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

    Jul 9, 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!

    • Dark Matter

      Dark matter makes up about 27% of the universe. Dark energy...

    • Space

      Build a model spacecraft to explore the universe! Paper...

    • Earth

      A tsunami is a large wave caused by movements in Earth''s...

  2. www.britannica.com › biography › Georges-LemaitreGeorges Lemaître | Big Bang Theory, Cosmology & Physics

    Jul 13, 2024 · Georges Lemaître was a Belgian astronomer and cosmologist who formulated the modern big-bang theory, which holds that the universe began in a cataclysmic explosion of a small, primeval “super-atom.” A civil engineer, Lemaître served as an artillery officer in the Belgian Army during World War I.

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  4. en.wikipedia.org › wiki › Chronology_of_the_universeChronology of the universe - Wikipedia

    2 days ago · Overview. Chronology in five stages. Diagram of evolution of the (observable part) of the universe from the Big Bang (left), the CMB -reference afterglow, to the present. For the purposes of this summary, it is convenient to divide the chronology of the universe since it originated, into five parts.

  5. en.wikipedia.org › wiki › UniverseUniverse - Wikipedia

    2 days ago · The prevailing model for the evolution of the universe is the Big Bang theory. The Big Bang model states that the earliest state of the universe was an extremely hot and dense one, and

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    • Big Bang Theory - Our Universe - The Beginning Of The Space & Time
    • The Big Bang & the Formation of the Universe - Maggie's Science Connection
    • The Universe, Big Bang Theory and The Evolution of The Universe - PMF IAS
    • Learn The Origin Of The Universe With Big Bang Theory | Stillunfold

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  7. www.britannica.com › science › cosmology-astronomyCosmology - Expansion, Universe, Big Bang | Britannica

    Jun 28, 2024 · According to the evolutionary, or big bang, theory of the universe, the universe is expanding while the total energy and matter it contains remain constant. Therefore, as the universe expands, the density of its energy and matter must become progressively thinner.

  8. en.wikipedia.org › wiki › Lambda-CDM_modelLambda-CDM model - Wikipedia

    2 days ago · v. t. e. The Lambda-CDM, Lambda cold dark matter, or ΛCDM model is a mathematical model of the Big Bang theory with three major components: a cosmological constant, denoted by lambda (Λ), associated with dark energy. the postulated cold dark matter, denoted by CDM. ordinary matter.

  9. www.britannica.com › science › cosmic-microwave-backgroundCosmic microwave background | Electromagnetic Radiation & Big...

    Jul 16, 2024 · Beginning in 1948, the American cosmologist George Gamow and his coworkers, Ralph Alpher and Robert Herman, investigated the idea that the chemical elements might have been synthesized by thermonuclear reactions that took place in a primeval fireball.

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