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

    Jul 26, 2023 · The Big Bang Theory explains how the universe began with an infinitely hot and dense single point that inflated to form the ever-expanding cosmos we see today.

    • 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...

    • What Came Before The Big Bang

      For a general overview of the Big Bang theory, check out...

    • Did

      Bringing the story back to "The Big Bang Theory" episode, a...

    • Multiverse

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

    • Planck Satellite

      This graphic illustrates the evolution of satellites...

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

    The Big Bang is a physical theory that describes how the universe expanded from a primordial state of high density and temperature. 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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  4. 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!

  5. 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.

  6. 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.

  7. www.space.com › 13320-big-bang-universe-10-steps-explainerThe history of the universe: Big Bang to now in 10 easy steps -...

    Feb 2, 2022 · The history of the universe and how it evolved is broadly accepted as the Big Bang model, which states that the universe began as an incredibly hot, dense point roughly 13.7 billion years ago....

  8. www.universetoday.com › 54756Big Bang Theory: Evolution of Our Universe - Universe Today

    Dec 17, 2015 · Learn how the Big Bang Theory explains the origin and evolution of the cosmos from a singularity to the present day. Explore the evidence, timeline and history of the Universe from the Planck Epoch to the current epoch.