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   Big Bang

   /ˌbɪɡ ˈbaŋ/

   noun

   • 1. the rapid expansion of matter from a state of extremely high density and temperature which according to current cosmological theories marked the origin of the universe.
   • 2. (in the UK) the introduction in 1986 of major changes in trading on the Stock Exchange, principally involving widening of membership, relaxation of rules for brokers, and computerization.

   Word Origin 1940s: first used in 1949 by the British astrophysicist Sir Fred Hoyle (see Hoyle, Sir Fred), who actually disagreed with the theory, preferring the steady state model.

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2. People also ask

   What is the Big Bang theory?

   • 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.

   What is the Big Bang Theory? | Space

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   What happened after the Big Bang?

   • A flood of matter and radiation, known as "reheating," began populating our universe with the stuff we know today: particles, atoms, the stuff that would become stars and galaxies and so on. Hubble images show the far-distant galaxy GN-z11 as it appeared shortly after the Big Bang. (Image credit: NASA)

   What is the Big Bang Theory? | Space

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   What is the Big Bang model?

   • Big-bang model, widely held theory of the evolution of the universe. Its essential feature is the emergence of the universe from a state of extremely high temperature and density—the so-called big bang that occurred 13.8 billion years ago. Learn more about the big-bang model in this article.

   Big-bang model | Definition, Evidence, Videos, & Facts

   www.britannica.com/science/big-bang-model

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   What does the Big Bang theory say about the universe?

   • The Big Bang Theory says that the CMB would be mostly the same, no matter where you look. Examining the CMB also gives astronomers clues as to the composition of the universe.

   What is the Big Bang Theory? | Space

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   How did astronomers explain the Big Bang?

   • 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! What's This Big Bang All About? In 1927, an astronomer named Georges Lemaître had a big idea.

   What Is the Big Bang? | NASA Space Place – NASA Science for Kids

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   Why is the Big Bang called the birth of the universe?

   • In either case, "the Big Bang" as an event is also colloquially referred to as the "birth" of our universe since it represents the point in history where the universe can be verified to have entered into a regime where the laws of physics as we understand them (specifically general relativity and the Standard Model of particle physics) work.

   Big Bang - Wikipedia

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

   www.space.com › 25126-

   • Cached

   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.

   • Infographic

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

   • Planck Satellite

     This graphic illustrates the evolution of satellites...

   • Killed The Pigeons

     The term "Big Bang" "is a bit vague," Guth said. "People use...

   • Cosmic Anniversary

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

   • Did

     A big chunk of the plot focuses on who would get the Nobel...

   • Soyuz Spacecraft

     The Soyuz is a type of spacecraft that the Soviet Union, and...

   • Multiverse

     "Our Big Bang is one episode and may be followed [and/or may...

   • Mike Massimino

     Mike Massimino and "The Big Bang Theory" Star and Producer....

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

   spaceplace.nasa.gov › big-bang › en

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   6 days ago · What Is the Big Bang? 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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5. Videos

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     What Triggered the Big Bang? | How the Universe Works

     Mar 7, 2020

     788K Views

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     5:55

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     The Beginning of Everything -- The Big Bang

     Mar 3, 2014

     14.6M Views

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     1:21

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     Space & Astronomy | How’s our Universe Created? | The Big Bang Explained in 1 Min | Science for Kids

     Aug 26, 2022

     28.9K Views

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

   en.wikipedia.org › wiki › Big_Bang

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   The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The notion of an expanding universe was first scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations .

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

   science.nasa.gov › universe › the-big-bang

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   Learn how the universe evolved from the Big Bang, the origin of all matter and energy, and what it is made of. Discover the latest discoveries and stories from NASA's cosmology research and missions.

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

   www.britannica.com › science › big-bang-model

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   The big-bang model is the widely held theory of the evolution of the universe from a state of extremely high temperature and density 13.8 billion years ago. It is based on Einstein's theory of relativity and the cosmological principle, and predicts the abundances of matter, radiation, and neutrinos in the present universe.

   • Author: The Editors of Encyclopaedia Britannica

9. www.sciencealert.com › big-bangWhat Is The Big Bang? - ScienceAlert

   www.sciencealert.com › big-bang

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   The Big Bang is a theory that explains how the Universe came from a singularity of infinite energy 13.8 billion years ago. Learn how astronomers discovered the expansion of the Universe, how the Big Bang happened and what it means for physics.

10. science.nasa.gov › hubble-big-bangHubble Big Bang - Science@NASA

    science.nasa.gov › hubble-big-bang

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    Big Bang. The big bang theory of the universe starts with a single point which rapidly expanded and slowly evolved into the cosmos we see today. Some 13.8 billion years ago, the universe was a dense, tremendously hot (too hot for the existence of atoms), extremely tiny point that rapidly surged outward in all directions.