Big-bang model | Definition, Evidence, Videos, & Facts | Britannica
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 …
仅显示来自 britannica.com 的搜索结果Cosmological Principle
big-bang model. In big-bang model. The second assumption, called the …
Cosmological Model
Other articles where cosmological model is discussed: cosmology: Einstein’s model: …
Expanding Universe
UNESCO-EOLSS - Expansion of The Universe - Standard Big Bang Model; …
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. The notion of an expanding universe was first scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations.
Independent of Friedmann's work, the Big Bang was first proposed in 1931 byWikipedia · CC-BY-SA 许可下的文字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 Big Bang - NASA Science
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.
The history of the universe: Big Bang to now in 10 easy steps
- How it all started. The Big Bang was not an explosion in space, as the theory's name might …
- The universe's first growth spurt. When the universe was very young — something like a …
- Too hot to shine. Light chemical elements were created within the first three minutes of the …
- Let there be light. About 380,000 years after the Big Bang, matter cooled enough for …
- Emerging from the cosmic dark ages. Roughly 400 million years after the Big Bang, the …
What happened in the early universe? | Center for Astrophysics ...
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 …
The science behind the Big Bang theory | Astronomy.com
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. An end-on view of one...
The big bang - Institute of Physics
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, …
WMAP Big Bang Concepts - NASA
2014年1月24日 · The Big Bang model of cosmology rests on two key ideas that date back to the early 20th century: General Relativity and the Cosmological Principle. By assuming that the matter in the universe is distributed uniformly …
WMAP Big Bang Theory - NASA
2012年3月1日 · The Big Bang Model is a broadly accepted theory for the origin and evolution of our universe. It postulates that 12 to 14 billion years ago, the portion of the universe we can see today was only a few millimeters across.