The Universe Has a Background Glow of Microwave Radiation

This "cosmic microwave background" (CMB) is the oldest light in the universe, a leftover from the Big Bang when the universe was only about 380,000 years old. It's evidence supporting the Big Bang theory.

Source

https://www.nasa.gov/universe/what-is-the-cosmic-microwave-background-radiation/

Details

Published: March 29, 2026
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Scientific Astronomy Physics Cosmic Microwave Background Big Bang Universe Radiation Cosmology

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