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  1. Cosmic microwave background - Wikipedia

    The cosmic microwave background (CMB, CMBR), or relic radiation, is microwave radiation that fills all space in the observable universe. With a standard optical telescope, the background space between …

  2. What is the cosmic microwave background? - Space.com

    Jan 28, 2022 · The cosmic microwave background (CMB) is primeval radiation emitted shortly after the Big Bang. Regarded as an 'echo' of the Big Bang, CMB fills the universe.

  3. ESA - Cosmic Microwave Background (CMB) radiation

    The Cosmic Microwave Background (CMB) is the cooled remnant of the first light that could ever travel freely throughout the Universe. This 'fossil' radiation, the furthest that any telescope can see, was …

  4. Cosmic microwave background | Electromagnetic Radiation & Big …

    Dec 12, 2025 · Beginning in 1948, the American cosmologist George Gamow and his coworkers, Ralph Alpher and Robert Herman, investigated the idea that the chemical elements might have been …

  5. Cosmic Microwave Background Radiation (CMB or CMBR)

    Aug 25, 2024 · Learn about the cosmic microwave background radiation (CMB or CMBR), including what it is and why it is important in cosmology.

  6. Cosmic Microwave Background | Center for Astrophysics | Harvard ...

    The cosmic microwave background is a snapshot of the oldest light in our universe, from when the cosmos was just 380,000 years old. The colors of the map represent small temperature fluctuations …

  7. The Cosmic Echo: How the Microwave Background Supports the Big …

    The Cosmic Microwave Background (CMB) is the remnant radiation from the early universe, specifically from about 380,000 years after the Big Bang. During this time, the universe cooled enough for …

  8. The Cosmic Microwave Background: The Oldest Light in the Universe

    Mar 24, 2025 · Every atom in your body was forged in stars, and those stars grew from the seeds planted in the fluctuations of the Cosmic Microwave Background. When we study it, we are looking at …

  9. Cosmic Microwave Background (CMB) - Fermilab

    Radiation from the Cosmic Microwave Background (CMB) provides a snapshot of the universe at a time only 380,000 years after the Big Bang. The well-understood dynamics of the CMB enable precise …

  10. The Cosmic Microwave Background | Faculty of Mathematical ... - UCL

    The fossilized heat of the Big Bang, the cosmic microwave background (CMB), has been the foundation for the age of precision cosmology. The most revealing CMB data so far has come from ESA's …