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The big-bang model is the widely accepted theory of the origin and evolution of the universe from a hot and dense state 13.8 billion years ago. Learn about its assumptions, predictions, observations, and challenges from Britannica's editors and experts.
- Big Bang Theory
The big bang theory is a general theory held by many...
- Planck Time
big-bang model. In big-bang model …a certain epoch called...
- Cosmological Principle
Other articles where cosmological principle is discussed:...
- Antimatter
antimatter, substance composed of subatomic particles that...
- Expanding Universe
Einstein, the big bang, and the expansion of the universe....
- Martin Rees
Martin Rees, English cosmologist and astrophysicist who was...
- Big Bang Theory
Jul 26, 2023 · The Big Bang Theory is the leading explanation for how the universe began. Simply put, it says the universe as we know it started with an infinitely hot and dense single point that inflated and ...
May 22, 2022 · Learn about the Big Bang Theory, the most accepted explanation for the origin and evolution of the universe. Discover the evidence, facts, and alternative theories for this cosmological model.
- Timeline of The Big Bang Theory
- Singularity Epoch
- Inflation Epoch
- Cooling Epoch
- Structure Epoch
- Long-Term Predictions For The Future of The Universe
- History of The Big Bang Theory
- More Resources on The Big Bang Theory
Working backwards from the current state of the Universe, scientists have theorized that it must have originated at a single point of infinite density and finite time that began to expand. After the initial expansion, the theory maintains that Universe cooled sufficiently to allow the formation of subatomic particles, and later simple atoms. Giant ...
Also known as the Planck Epoch(or Planck Era), this was the earliest known period of the Universe. At this time, all matter was condensed on a single point of infinite density and extreme heat. During this period, it is believed that the quantum effects of gravity dominated physical interactions and that no other physical forces were of equal stren...
With the creation of the first fundamental forces of the universe, the Inflation Epoch began, lasting from 10-32 seconds in Planck time to an unknown point. Most cosmological models suggest that the Universe at this point was filled homogeneously with a high-energy density, and that the incredibly high temperatures and pressure gave rise to rapid e...
As the universe continued to decrease in density and temperature, the energy of each particle began to decrease and phase transitions continued until the fundamental forces of physics and elementary particles changed into their present form. Since particle energies would have dropped to values that can be obtained by particle physics experiments, t...
Over the course of the several billion years that followed, the slightly denser regions of the almost uniformly distributed matter of the Universe began to become gravitationally attracted to each other. They therefore grew even denser, forming gas clouds, stars, galaxies, and the other astronomical structures that we regularly observe today. This ...
Hypothesizing that the Universe had a starting point naturally gives rise to questions about a possible end point. If the Universe began as a tiny point of infinite density that started to expand, does that mean it will continue to expand indefinitely? Or will it one day run out of expansive force, and begin retreating inward until all matter crunc...
The earliest indications of the Big Bang occurred as a result of deep-space observations conducted in the early 20th century. In 1912, American astronomer Vesto Slipher conducted a series of observations of spiral galaxies (which were believed to be nebulae) and measured their Doppler Redshift. In almost all cases, the spiral galaxies were observed...
We have many interesting articles about the Big Bang here at Universe Today. For instance, here is What is the Evidence of the Big Bang?, What Came Before the Big Bang?, A New Theory About Of The Universe’s Creation, and What is Cosmic Background Radiation? For more information, check out NASA’s page on the Big Bang Theory. NASA’s WMAP mission webp...
- 4 min
Feb 2, 2022 · Step 2: The universe's first growth spurt. Step 3: Too hot to shine. Step 4: Let there be light. Step 5: Emerging from the cosmic dark ages. Step 6: More stars and more galaxies. Step 7: Birth of ...
May 6, 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!
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Learn how the universe evolved from the Big Bang to the present day, and what the cosmos is made of. Read articles about dark energy, cosmic web, lunar crater radio telescope, and more.
