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  1. en.wikipedia.org › wiki › Cosmic_microwave_backgroundCosmic 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 stars and galaxies is almost completely dark.

  2. www.space.com › 33892-cosmic-microwave-backgroundWhat is the cosmic microwave background? | Space

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

    3 days ago · 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.

  4. www.esa.int › Space_Science › PlanckESA - Planck and the cosmic microwave background

    The cosmic microwave background (or CMB) fills the entire Universe and is leftover radiation from the Big Bang. When the Universe was born, nearly 14 billion years ago, it was filled with hot plasma of particles (mostly protons, neutrons, and electrons) and photons (light).

  5. www.cfa.harvard.edu › research › topicCosmic Microwave Background | Center for Astrophysics | Harvard...

    This light is called the cosmic microwave background (CMB), and it carries information about the very early universe. Astronomers use the patterns in CMB light to determine the total contents of the universe, understand the origins of galaxies, and look for signs of the very first moments after the Big Bang.

  6. www.esa.int › Science_Exploration › Space_ScienceCosmic Microwave Background (CMB) radiation - ESA

    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.

  7. www.scientificamerican.com › article › what-is-the-cosmic-microwWhat is the cosmic microwave background radiation?

    Nov 1, 2004 · The Cosmic Microwave Background radiation, or CMB for short, is a faint glow of light that fills the universe, falling on Earth from every direction with nearly uniform intensity.

  8. cmb.sites.stanford.edu › research › cosmologyThe Cosmic Microwave Background | CMB constellation

    We see this ancient light today as the cosmic microwave background (CMB) filling our sky uniformly at 2.7 Kelvin. By measuring the patterns in the CMB, we can extract a huge amount of information about the conditions and evolution of the early universe.

  9. science.nasa.gov › mission › cobeCOBE - NASA Science

    COBE discovered that the CMB (cosmic microwave background) — the oldest light in the universe — contained tiny temperature variations, the seeds for galaxies and other large-scale structure seen in the universe today.

  10. www.anl.gov › cmbCosmic Microwave Background | Argonne National Laboratory

    Cosmic microwave background research explores the relic radiation left over today from an early hot phase of the universe.