What is the Big Bang Theory? | Space
Jul 26, 2023 · Learn about the leading explanation for how the universe started with an infinitely hot and dense single point that inflated and stretched over 13.7 billion years. Find out the...
What happened in the early universe? | Center for Astrophysics ...
Learn about the Big Bang Theory, the leading explanation for the origin of the Universe. Find out what happened in the first moments after the Big Bang, how scientists study the cosmic microwave background and the dark ages, and what theories challenge the standard 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. It explains various observed phenomena, such as the abundance of light elements, the CMB radiation, and large-scale structure, and is based on the assumptions of universal physical laws and cosmological principle.
The Big Bang - NASA Science
Learn how the universe originated, evolved, and is made of from NASA's perspective. Explore articles, stories, and topics about the Big Bang theory, dark energy, cosmic dawn, and more.
Big-bang model | Definition, Evidence, Videos, & Facts | Britannica
The big-bang model is the widely held theory of the evolution of the universe from a state of extremely high temperature and density 13.8 billion years ago. It is based on two assumptions: Einstein's general theory of relativity and the cosmological principle.
What is the Big Bang Theory? How did our universe begin?
Learn about the Big Bang Theory, the scientific definition of the origin and evolution of the universe. Explore the evidence that supports this theory, such as cosmic microwave background radiation, redshift of galaxies, and light elements, and compare it with other theories.
What Is the Big Bang? | NASA Space Place – NASA Science for Kids
Oct 11, 2024 · 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!
The history of the universe: Big Bang to now in 10 easy steps - Space.com
Feb 2, 2022 · Learn how the universe began as a hot, dense point 13.7 billion years ago and evolved through various stages of expansion, cooling, recombination and star formation. Explore the evidence...
What Is The Big Bang? - ScienceAlert
Learn about the theory of the Big Bang, which describes the expansion of the Universe from a singularity 13.8 billion years ago. Find out how astronomers discovered the expansion, how physics explains the inflation period, and what challenges the theory faces.
Big Bang: How the Universe was created - BBC
Critics dismissed this: the celebrated astronomer Fred Hoyle sarcastically called this concept the “Big Bang” theory, a phrase that would later be adopted by its proponents.