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. [1] The notion of an expanding universe was first scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations .
The Big Bang - NASA Science
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 more.
What existed before the Big Bang? - BBC
Our Big Bang might be the rebirth of one single quantum multiverse, containing infinitely many different universes all occurring together. Everything possible happens – then it happens again...
What is the Big Bang Theory? | Space
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.
The history of the universe: Big Bang to now in 10 easy steps - Space.com
Feb 2, 2022 · The history of the universe and how it evolved is broadly accepted as the Big Bang model, which states that the universe began as an incredibly hot, dense point roughly 13.7 billion years ago....
The Big Bang: How Could Something Come From Nothing?
Jan 19, 2022 · The evolution of the cosmos after the Big Bang. Credit: NASA. Theories about the universe’s origin and ultimate fate often center on how matter could emerge from nothing.
What happened in the early universe? | Center for Astrophysics ...
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?
What Is the Big Bang? | NASA Space Place – NASA Science for Kids
Nov 8, 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!
What Triggered the Big Bang? It's Complicated (Op-Ed) - Space.com
Nov 23, 2015 · The 1st few seconds of the Big Bang: What we know and what we don't 5 failed alternatives to the Big Bang theory and why they didn't work
How do we know the Big Bang actually happened? - BBC Teach
People talk about the universe starting with a Big Bang, but how could we possibly know anything about an event that happened billions of years ago – before our planet was even formed?