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The Big Bang was the initiation of the continuing expansion of the universe from a state of high density and temperature ( its central singularity ). [1] . It was first proposed as a physical theory in 1931 by Roman Catholic priest and physicist Georges Lemaître when he suggested the universe emerged from a "primeval atom".
May 6, 2024 · 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!
Jul 26, 2023 · The Big Bang Theory is the leading explanation for how the universe began. Simply put, it says the universe as we know it started with an infinitely hot and dense single point that inflated and...
The Big Bang - NASA Science. Explore Cosmic History. Study how the universe evolved, learn about the fundamental forces , and discover what the cosmos is made of. Overview. The origin, evolution, and nature of the universe have fascinated and confounded humankind for centuries.
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 Editors of Encyclopaedia Britannica
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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? Our Work. 10 -33 Seconds.
Sep 30, 2022 · What is the Big Bang? About 13.8 billion years ago, the universe sprang into existence in an event known as the big bang. The early universe was incredibly hot — too hot for even atoms to exist — and extraordinarily dense. As the universe expanded, its temperature and density decreased. Atoms formed, then molecules.