Search results
May 22, 2022 · The Big Bang Theory is the most accepted cosmological model explaining the origin and evolution of the universe. The theory says that all the energy and spacetime in the universe were...
Oct 21, 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.
- The Editors of Encyclopaedia Britannica
Mar 24, 2022 · Light from these first stars turned the surrounding gas into a hot, ionized plasma — a crucial transformation known as cosmic reionization that propelled the universe into the complex structure that we see today.
- How it all started. The Big Bang was not an explosion in space, as the theory's name might suggest. Instead, it was the appearance of space everywhere in the universe, researchers have said.
- The universe's first growth spurt. When the universe was very young — something like a hundredth of a billionth of a trillionth of a trillionth of a second (whew!)
- Too hot to shine. Light chemical elements were created within the first three minutes of the universe's formation. As the universe expanded, temperatures cooled and protons and neutrons collided to make deuterium, which is an isotope of hydrogen.
- Let there be light. About 380,000 years after the Big Bang, matter cooled enough for electrons to combine with nuclei to form neutral atoms. This phase is known as "recombination," and the absorption of free electrons caused the universe to become transparent.
The "Big Bang" is the term given to what is currently the most widely accepted scientific model for the origin and evolution of the Universe. This model has supplanted other models such as the Steady State theory proposed by Hoyle, Bondi and Gold in the 1940s.
Oct 1, 1994 · October 1, 1994. 17 min read. The Evolution of the Universe. Some 15 billion years ago the universe emerged from a hot, dense sea of matter and energy. As the cosmos expanded and cooled, it...
People also ask
Why is the Big Bang theory the prevailing cosmological model?
How did the universe evolve?
What is the Big Bang model?
How has the universe changed over time?
When did the universe start?
Will a new cosmology include the Big Bang?
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 more. Big Bang Stories.
