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  1. 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.

    • Killed The Pigeons

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

    • Cosmic Anniversary

      The landmark find put the Big Bang theory on solid ground,...

    • Infographic

      An early rival to the Big Bang theory, Steady State posits...

    • Images

      NASA . The Big Bang theory proposes that the universe began...

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

    Jun 13, 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!

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

    Jun 18, 2024 · 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 assumptions, predictions, and observations that support this theory, as well as its alternatives and controversies.

  5. 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] . 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".

  6. www.thoughtco.com › what-is-the-big-bang-theory-2698849Understanding the Big-Bang Theory - ThoughtCo

    Jun 11, 2019 · The big-bang theory is the dominant theory of the origin of the universe. In essence, this theory states that the universe began from an initial point or singularity, which has expanded over billions of years to form the universe as we now know it.

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

    Overview. The origin, evolution, and nature of the universe have fascinated and confounded humankind for centuries. New ideas and major discoveries made during the 20th century transformed cosmology – the term for the way we conceptualize and study the universe – although much remains unknown. Learn more.

  8. astronomyexplained.com › what-is-the-big-bang-theory-how-didWhat is the Big Bang Theory? How did our universe begin?

    Learn how the Big Bang Theory explains the origin and evolution of the universe from a singularity 13.8 billion years ago. Explore the evidence, such as cosmic microwave background radiation, redshift of galaxies, and light elements, and the critiques and alternatives to this theory.