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1. en.wikipedia.org › wiki › Big_BangBig Bang - Wikipedia

   en.wikipedia.org › wiki › Big_Bang

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   The Big Bang is a physical theory that describes how the universe expanded from an initial 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".

2. spaceplace.nasa.gov › big-bang › enWhat Is the Big Bang? - NASA Space Place

   spaceplace.nasa.gov › big-bang › en

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   Jul 9, 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!

3. science.nasa.gov › universe › the-big-bangThe Big Bang - NASA Science

   science.nasa.gov › universe › the-big-bang

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   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.