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   What happened in the early universe?

   • About 13.8 billion years ago, the Big Bang gave rise to everything, everywhere, and everywhen—the entire known Universe. What caused the Big Bang? What happened that first moment at the beginning of the Big Bang?

   What happened in the early universe? - Center for Astrophysics

   www.cfa.harvard.edu/big-questions/what-happened-early-universe

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   How did the Big Bang affect the universe?

   • For the first 380,000 years after the Big Bang, however, the intense heat from the universe's creation made it essentially too hot for light to shine. Atoms crashed together with enough force to break up into a dense, opaque plasma of protons, neutrons and electrons that scattered light like fog.

   The history of the universe: Big Bang to now in 10 easy steps - Space.com

   www.space.com/13320-big-bang-universe-10-steps-explainer.html

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   What happened after the Big Bang?

   • The universe cooled rapidly as it blew outward, however, and by 10–35 second after the Big Bang, the epoch of inflation occurred, enlarging the universe by a factor of 1050 in only 10–34 second. During this wild period, cosmic strings, monopoles, and other exotic species likely came to be.

   How Did the Big Bang Happen? | Astronomy.com

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   Was the Big Bang an explosion in space?

   • (Image credit: NASA/WMAP Science Team) The Big Bang was not an explosion in space, as the theory's name might suggest. Instead, it was the appearance of space everywhere in the universe, researchers have said. According to the Big Bang theory, the universe was born as a very hot, very dense, single point in space.

   The history of the universe: Big Bang to now in 10 easy steps - Space.com

   www.space.com/13320-big-bang-universe-10-steps-explainer.html

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2. www.space.com › 31192-what-triggered-the-big-bangWhat Triggered the Big Bang? It's Complicated | Space

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   Nov 23, 2015 · The CMB is not only one of the major pieces of evidence for the Big Bang (it's a baby picture of the universe…what else could you ask for?), but it's also a window to even earlier times.

   • New Simulations Explore Supernova Explosions, Universe's Evolution

     The other simulation provides an amazing detailed map of the...

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     The simulation - called Illustris - covers about 13 billion...

3. www.astronomy.com › science › how-did-the-big-bangHow Did the Big Bang Happen? | Astronomy.com

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   Jul 1, 2019 · Virtually all astronomers and cosmologists agree the universe began with a “big bang” — a tremendously powerful genesis of space-time that sent matter and energy reeling outward.

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

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   The Big Bang - NASA Science. Explore Cosmic History. Study how the universe evolved, learn about the fundamental forces , and discover what the cosmos is made of. Overview. The origin, evolution, and nature of the universe have fascinated and confounded humankind for centuries.

5. Videos

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     Cosmology: A Big Bang and the Beginning of the Universe

     13 Jul 2018

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     4:29

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     Big Bang Theory: Evolution of Our Universe

     31 Dec 2008

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     Was the Big Bang the Beginning? Reimagining Time in a Cyclic Universe

     22 Dec 2023

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

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   XDF image shows fully mature galaxies in the foreground plane – nearly mature galaxies from 5 to 9 billion years ago – protogalaxies, blazing with young stars, beyond 9 billion years. The Big Bang models developed from observations of the structure of the universe and from theoretical considerations.

7. www.cfa.harvard.edu › big-questions › what-happenedWhat happened in the early universe? | Center for ...

   www.cfa.harvard.edu › big-questions › what-happened

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   About 13.8 billion years ago, the Big Bang gave rise to everything, everywhere, and everywhen—the entire known Universe. What caused the Big Bang? What happened that first moment at the beginning of the Big Bang? When did the first stars form?

8. www.space.com › 13320-big-bang-universe-10-stepsThe Universe: Big Bang to Now in 10 Easy Steps - Space

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   Feb 2, 2022 · So, how did the universe go from being fractions of an inch (a few millimeters) across to what it is today? Here is a breakdown of the Big Bang to now in 10 easy-to-understand steps.

9. www.iop.org › big-ideas-physics › big-bangThe big bang | Institute of Physics

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   How did the universe start? Most physicists believe the universe was born in a big bang 13.8 billion years ago. In it, the energy making up everything in the cosmos we see today was squeezed inside an inconceivably small space – far tinier than a grain of sand, or even an atom.