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Roughly 400 million years
- Roughly 400 million years after the Big Bang, the universe began to come out of its dark ages. This period in the universe's evolution is called the age of re-ionization.
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.
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.
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.
Feb 2, 2022 · Roughly 400 million years after the Big Bang, the universe began to come out of its dark ages. This period in the universe's evolution is called the age of re-ionization.
- 1 min
- Denise Chow,Scott Dutfield
May 1, 2024 · This lasts until the Universe reaches an age of about 380,000 years, and a temperature of merely ~3000 K. Atomic era: At last, at this point, 380,000 years after the Big Bang, the Universe...
- Ethan Siegel
Though the universe might in theory have a longer history, the International Astronomical Union presently uses the term "age of the universe" to mean the duration of the Lambda-CDM expansion, [16] or equivalently, the time elapsed within the currently observable universe since the Big Bang.
Apr 30, 2018 · We start out with the beginning of everything - the Big Bang, which gave rise to the Universe 13.8 billion years ago. The event birthed the oldest known star in the Universe, Methuselah, located about 190.1 light-years away from Earth.
