Big Bang - Wikipedia
The Big Bang models offer a comprehensive explanation for a broad range of observed phenomena, including the abundances of the light elements, the CMB, large-scale structure, and Hubble's law. [14] The models depend on two major assumptions: the universality of physical laws and the cosmological principle .
Big-bang model | Definition, Evidence, Videos, & Facts ...
2024年10月21日 · 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.
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 Universe: Big Bang to Now in 10 Easy Steps - Space
2022年2月2日 · The history of the universe and how it evolved is broadly accepted as the Big Bang model, which states that the universe began as an incredibly hot, dense point roughly 13.7 billion years ago....
Big Bang: Everything you need to know about the most accepted ...
2022年5月22日 · One of them is the steady-state model, which explains the expansion of the universe by positing an eternal creation of matter, maintaining its density over time. In this model, the universe...
The Big Bang - NASA Science
Study how the universe evolved, learn about the fundamental forces , and discover what the cosmos is made of. The origin, evolution, and nature of the universe have fascinated and confounded humankind for centuries.
What happened in the early universe? | Center for ...
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?