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The Big Bang is a theory that describes how the universe expanded from a hot and dense state. It explains various phenomena, such as the abundance of light elements, the CMB, and the large-scale structure, and is supported by many observations.
Aug 5, 2024 · 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!
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 how scientists at the Center for Astrophysics | Harvard & Smithsonian study the origin and evolution of the Universe, from the Big Bang to the first stars and black holes. Explore their projects, telescopes, and instruments to observe the cosmic microwave background, the dark ages, and inflation.
Jul 26, 2023 · 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.
Sep 30, 2022 · Learn about the big bang, the event that created the universe 13.8 billion years ago. Find out how astronomers measure the expansion rate of the universe and what it reveals about its age and history.
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Jul 29, 2024 · 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.