How Was the Universe Created? - Encyclopedia Britannica
Nov 11, 2025 · The most widely accepted explanation for the origin of the universe is the big-bang theory, which proposes that the universe began approximately 13.8 billion years ago in an extremely …
How Was the Universe Born? | NIST
Jul 17, 2025 · For the first time, light streamed freely through the cosmos. The light released at that moment is the oldest cosmic event that we can measure. Scientists discovered this “cosmic …
How was the Universe formed and why is it still expanding? - BBC
From this tiny point, the whole Universe expanded outwards to what exists today. The Universe is thought to have originated 13.8 billion years ago from a very small, extremely hot and dense region...
How the Universe Began - sciencenewstoday.org
Jul 26, 2025 · What came before the Big Bang — if “before” even means anything? Some theories suggest our universe is just one bubble in a multiverse — an infinite sea of universes, each with …
Overview - NASA Science
Oct 22, 2024 · Around 13.8 billion years ago, the universe expanded faster than the speed of light for a fraction of a second, a period called cosmic inflation. Scientists aren’t sure what came before inflation …
How Did the Universe Begin? - AMNH
The Big Bang was the moment 13.8 billion years ago when the universe began as a tiny, dense, fireball that exploded. Most astronomers use the Big Bang theory to explain how the universe began.
Formation of the Universe | Physical Geography - Lumen Learning
An enormous explosion—a big bang—caused the universe to start expanding rapidly. All the matter and energy in the universe, and even space itself, came out of this explosion.
Origins and the Universe – Science for Developing Scientifically ...
The Big Bang is the best-supported scientific theory for how the universe was created. 13.7 billion years ago there was nothing and nowhere. Everything that ever existed was contained in a subatomic …
What happened in the early universe? | Center for Astrophysics ...
To complement LEDA’s cosmic dark age research, scientists at the CFA Institute for Theory and Computation run simulations of the early Universe and how the first stars formed. After dark matter …
How Did the Universe Begin?
Sep 22, 2024 · One of the biggest questions in modern astronomy is the origins of the universe. How did it begin and evolve into what we know today?