What Was the Size of the Universe at 380,000 Years Old?

Discover how small the universe was at 380,000 years old during the recombination era.

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At 380,000 years old, the universe was about 1,100 times smaller than it is today. During this period, known as the recombination era, the universe cooled enough for protons and electrons to combine and form neutral hydrogen atoms, leading to the decoupling of matter and radiation and the release of the cosmic microwave background radiation.

FAQs & Answers

  1. What happened during the recombination era? The recombination era is when the universe cooled enough for protons and electrons to form neutral hydrogen atoms, leading to the release of cosmic microwave background radiation.
  2. Why is the cosmic microwave background radiation important? It provides evidence for the Big Bang and offers insights into the early state of the universe.
  3. How does the size of the universe change over time? The universe expands over time, influencing galaxy formation and cosmic structures.
  4. What did the universe contain at 380,000 years old? At this age, the universe consisted mainly of protons, electrons, and photons before matter and radiation decoupled.

Watch More

For further insights into the early universe and its evolution, check out our videos on cosmic background radiation and the formation of galaxies.

  1. Understanding the Universe: 400,000 Years After the Big Bang Explore what happened 400,000 years after the Big Bang, including the formation of hydrogen and the Cosmic Microwave Background.
  2. Understanding Recombination: The Formation of Hydrogen Atoms 380,000 Years After the Big Bang Discover what occurred 380,000 years post-Big Bang and learn about hydrogen atoms and Cosmic Microwave Background radiation.
  3. The Size of the Universe at 1 Second After the Big Bang Explained Discover how large the universe was just one second after the Big Bang, its temperature, and the fundamental particles present.