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.

Until we can directly detect the signatures of what was released earlier -- the cosmic neutrino background, gravitational waves from inflation, etc. -- the CMB will be our window into the earliest ...

This is the Cosmic Microwave Background, electromagnetic radiation from almost 13.8 billion years ago, immediately after the Big Bang. It’s the border of the known universe.

That’s what Jürgen Sörgel wants to know, asking: “The cosmic microwave background (CMB) was generated 380.000 years after the big bang, when the universe became transparent.

The cosmic microwave background radiation fills the universe and travels in all directions with near equal brightness, letting astronomers know this pillar of Big Bang cosmology is truly “cosmic.” ...

Key Takeaways: The cosmic microwave background’s “black body” curve shows that the early universe was in thermal equilibrium with a temperature of 2.725 kelvins.

(via Sabine Hossenfelder) In the Big Bang Theory, the cosmic microwave background — microwave-range radiation that floats through the entire universe at a steady 2.7 Kelvin — is evidence that a hot ...

Two Cosmic Microwave Background anomalies hinted at by the Planck observatory's predecessor, NASA's WMAP, are confirmed in new high-precision data revealed on March 21, 2013.