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Oct 20, 2022 · 380,000 years to 1 billion years after the Big Bang: During this enormously long Era of Atoms, matter grew into the remarkable variety we now know. The stable atoms of hydrogen and helium slowly drifted together in patches, due to gravity.
- The Big Bang
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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
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.
Feb 11, 2015 · June 1, 2023 — After the Big Bang, the universe expanded and cooled sufficiently for hydrogen atoms to form. In the absence of light from the first stars and galaxies, the...
- 1 min
- Denise Chow,Scott Dutfield
- 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.
Apr 30, 2022 · Roughly 400,000 years after our universe formed, the hot environment from the Big Bang finally began to cool. Before this moment, the universe was like one big, hot plasma.
Dec 1, 2014 · The CMB is radiation that has streamed through the universe since the first atoms formed about 380,000 years after the big bang. Thanks to the expansion of the universe, that radiation has cooled and stretched to microwave wavelengths.
