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Recombination
- 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.
www.space.com/13320-big-bang-universe-10-steps-explainer.htmlThe history of the universe: Big Bang to now in 10 steps | Space
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About 370,000 years after the Big Bang, two connected events occurred: the ending of recombination and photon decoupling. Recombination describes the ionized particles combining to form the first neutral atoms, and decoupling refers to the photons released ("decoupled") as the newly formed atoms settle into more stable energy states.
Oct 20, 2022 · 10-43 to 10-35 second after the Big Bang: Even within this tiny span, known as the Grand Unified Theory (GUT) Era, major changes take place. The most important event: Gravity becomes its own distinct force, separate from everything else.
Since the Big Bang, 13.7 billion years ago, the universe has passed through many different phases or epochs. Due to the extreme conditions and the violence of its very early stages, it arguably saw more activity and change during the first second than in all the billions of years since.
Feb 2, 2022 · Cosmologists are unsure what happened before this moment, but with sophisticated space missions, ground-based telescopes and complicated calculations, scientists have been working to paint a...
- 1 min
- Denise Chow,Scott Dutfield
- The Big Bang
- How Old Is The Universe?
- How Is It structured?
- Contents of The Universe
- What Shape Is It?
- Expanding Universe
- Additional Resources
- Bibliography
The Big Bang did not occur as an explosion in the usual way one think about such things, despite one might gather from its name. The universe did not expand into space, as space did not exist before the universe, according to NASA. Instead, it is better to think of the Big Bang as the simultaneous appearance of space everywhere in the universe. The...
The universe is currently estimated at roughly 13.8 billion years old, give or take 130 million years. In comparison, the solar system is only about 4.6 billion years old. This estimate came from measuring the composition of matter and energy density in the universe. This allowed researchers to compute how fast the universe expanded in the past. Wi...
Scientists think that in the earliest moments of the universe, there was no structure to it to speak of, with matter and energy distributed nearly uniformly throughout. According to NASA, the gravitational pull of small fluctuations in the density of matter back then gave rise to the vast web-like structure of stars and emptiness seen today. Dense ...
Until a few decades ago, astronomers thought that the universe was composed almost entirely of ordinary atoms, or "baryonic matter," according to NASA. However, recently there has been ever more evidence that suggests most of the ingredients making up the universe come in forms that we cannot see. It turns out that atoms only make up 4.6 percent of...
The shape of the universeand whether or not it is finite or infinite in extent depends on the struggle between the rate of its expansion and the pull of gravity. The strength of the pull in question depends in part on the density of the matter in the universe. If the density of the universe exceeds a specific critical value, then the universe is "c...
In the 1920s, astronomer Edwin Hubble discovered the universe was not static. Rather, it was expanding; a find that revealed the universe was apparently born in a Big Bang. After that, it was long thought the gravity of matter in the universe was certain to slow the expansion of the universe. Then, in 1998, the Hubble Space Telescope's observations...
Want to explore the universe for yourself? You can roam the Milky Way's stars and galaxies virtually using NASA's Hubble Skymap. Additionally, you can read 10 wild theories about the universein this article by Live Science.
"The first stars in the Universe". Monthly Notices of the Royal Astronomical Society: Letters, Volume 373, Issue 1 (2006). https://academic.oup.com/mnrasl/article/373/1/L98/989035?login=true "The molecular universe". Reviews of Modern Physics (2013). https://journals.aps.org/rmp/abstract/10.1103/RevModPhys.85.1021 "Hubble’s Law and the expanding un...
- 2 min
- Charles Q. Choi,Ailsa Harvey
Sep 20, 2022 · After the big bang, electricity and light filled the universe in what's called the epoch of reionization. The James Webb Space Telescope is hunting for more clues to explain this time...
Jan 8, 2021 · While often conflated, the Big Bang and the origin of time are distinct epochs. But what happened before the Big Bang may have laid the foundations for what came after.
