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The Big Bang is a physical theory that describes how the universe expanded from a primordial state of high density and temperature. [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".
The big-bang model is the widely accepted theory of the origin and evolution of the universe from a hot and dense state 13.8 billion years ago. Learn about its assumptions, predictions, observations, and challenges from Britannica's experts.
- The Editors of Encyclopaedia Britannica
Jul 26, 2023 · The Big Bang Theory is the leading explanation for how the universe began.
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!
Learn how the universe evolved from the Big Bang to the present day, and explore the fundamental forces and cosmic matter. Discover the latest discoveries and stories from NASA's cosmology research and missions.
Learn how the Big Bang theory explains the origin and evolution of the universe, from its explosive start 13.7 billion years ago to the present day. Discover the mysteries of dark matter and dark energy, and how CERN explores the physics of the early universe.
Jan 17, 2017 · Learn how the big bang theory describes the cosmic cataclysm that created the universe from a single primordial atom. Explore the key events and discoveries that support this theory, from inflation to cosmic microwave background radiation.
