What is the Big Bang Theory? | Space
网页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.
What Is the Big Bang? | NASA Space Place – NASA Science for Kids
网页2024年9月17日 · 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!
Big-bang model | Definition, Evidence, Videos, & Facts
网页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 - Wikipedia
网页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 .
Understanding the Big-Bang Theory - ThoughtCo
网页2019年6月11日 · 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 ...
网页The 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. We are interested in finding out what caused the Big Bang, and the physics involved in this primordial epoch.
The science behind the Big Bang theory | Astronomy.com
网页2023年12月18日 · Evidence of the Big Bang theory and what happened immediately after the expansion. By Astronomy Staff | Published: December 18, 2023 | Last updated on December 20, 2023
The Big Bang - NASA Science
网页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. Learn more.
What is the Big Bang Theory? How did our universe begin?
网页The Big Bang Theory explains the observed redshift of distant galaxies, the cosmic microwave background radiation, and the abundance of light elements in the universe. It provides a coherent narrative for the development of the cosmos from its earliest moments to the present day.
How the Big Bang Theory Works - HowStuffWorks
网页The big bang is an attempt to explain how the universe developed from a very tiny, dense state into what it is today. It doesn't attempt to explain what initiated the creation of the universe, or what came before the big bang or even what lies outside the universe.
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