Big 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] The notion of an expanding universe was first scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations.
What is the Big Bang Theory? | Space
2023年7月26日 · 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.
The science behind the Big Bang theory | Astronomy.com
2023年12月18日 · The first and most confident evidence we have came from 1964 when scientists at the Bell Labs discovered the cosmic microwave background radiation, confirming there was a Big Bang.
The Big Bang - NASA Science
2024年2月28日 · Explore All Big Bang Stories 24 Min Read. The Mind-Bending Math Inside Black Holes. Article. 6 Min Read. How NASA’s Roman Space Telescope Will Illuminate Cosmic Dawn ... National Aeronautics and Space Administration. NASA explores the unknown in air and space, innovates for the benefit of humanity, and inspires the world through discovery ...
What Is the Big Bang? | NASA Space Place – NASA Science for …
2025年1月14日 · 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!
How Did the Big Bang Happen? | Astronomy.com - Astronomy …
2019年7月1日 · 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.
NASA’s James Webb Space Telescope and the Big Bang: A Short …
2017年10月11日 · We see an infinite universe with distant galaxies all rushing away from each other. The name Big Bang conveys the idea of a firecracker exploding at a time and a place — with a center. The universe doesn’t have a center, at least not one we can find. The Big Bang happened everywhere at once and was a process happening in time, not a point ...
Big Bang - Science@NASA
2024年10月22日 · 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.
Big-bang model | Definition, Evidence, Videos, & Facts | Britannica
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.
NASA Spotlite: The Big Bang | NASA+
2023年10月26日 · This animation begins with a pinpoint of light as the Big Bang, and continues to show the formation of the first stars and galaxies.