Big Bang - Wikipedia
WEBThe 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. [2] [3] [4] [5]
Big-bang model | Definition, Evidence, Videos, & Facts
WEBJul 29, 2024 · 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.
The big bang - Institute of Physics
WEBMost 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.
The Big Bang - NASA Science
WEBStudy how the universe evolved, learn about the fundamental forces , and discover what the cosmos is made of.
What is the Big Bang Theory? | Space
WEBJul 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.
Understanding the Big-Bang Theory - ThoughtCo
WEBJun 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.
What happened in the early universe? | Center for Astrophysics ...
WEBThe Big Bang theory of cosmology successfully describes the 13.7 billion years of evolutionary history of our Universe. However, it is known that the current Big Bang theory cannot self-consistently explain its initial conditions.
The early universe - CERN
WEBHubble’s discovery was the first observational support for Georges Lemaître’s Big Bang theory of the universe, proposed in 1927. Lemaître proposed that the universe expanded explosively from an extremely dense and hot state, and continues to expand today.
13.5: The Basic Big Bang Model - Physics LibreTexts
WEBThe best and most widely accepted current model for how our Universe changes over time is usually referred to as the standard Big Bang theory, or model. The Big Bang model is based on general relativity and other models from physics and is supported by much observational evidence.
11.7: The Big Bang - Physics LibreTexts
WEBSep 12, 2022 · Scientists who study the origin, evolution, and ultimate fate of the universe (cosmology) believe that the universe began in an explosion, called the Big Bang, approximately 13.7 billion years ago. This explosion was not an explosion of particles through space, like fireworks, but a rapid expansion of space itself.
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