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  1. en.wikipedia.org › wiki › Cosmic_microwave_backgroundCosmic microwave background - Wikipedia

    The cosmic microwave background (CMB or CMBR) is microwave radiation that fills all space in the observable universe. It is a remnant that provides an important source of data on the primordial universe. [1]

  2. en.wikipedia.org › wiki › Discovery_of_cosmic_microwaveDiscovery of cosmic microwave background radiation - Wikipedia

    In 1964, US physicist Arno Allan Penzias and radio-astronomer Robert Woodrow Wilson discovered the cosmic microwave background (CMB), estimating its temperature as 3.5 K, as they experimented with the Holmdel Horn Antenna.

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  4. www.esa.int › Cosmic_Microwave_Background_CMB_radiationESA - 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 released soon after the 'Big Bang'.

  5. www.britannica.com › science › cosmic-microwave-backgroundCosmic microwave background | Electromagnetic Radiation & Big...

    14. Mai 2024 · cosmic microwave background (CMB), electromagnetic radiation filling the universe that is a residual effect of the big bang 13.8 billion years ago. Because the expanding universe has cooled since this primordial explosion, the background radiation is in the microwave region of the electromagnetic spectrum.