The Cosmic Microwave Background (or âCMBâ for short) is radiation from around 400,000 years after the start of the Universe. How did E. P. Hubble prove that the Andromeda spiral nebula is another galaxy, and not something inside our galaxy? or CMBR. 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. While this radiation is invisible using optical telescopes, radio telescopes are able to detect the faint signal (or glow) that is strongest in the microwave region of the radio spectrum. It fills the background of the universe almost uniformly, but highly sensitive instruments, such as the Planck Telescope, can detect minute variations in this apparent uniformity. 6. 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). In view of the importance of cosmic microwave background radiation to the Big Bang model of the universe (no other model has explained CMB quite so neatly), efforts were redoubled in an attempt to definitively prove the connection, first in the form of the Cosmic Background Explorer (COBE) satellite in 1989, and then the Wilkinson Microwave Anisotropy Probe (WMAP) in 2001. The background radiation in the Universe is a form of electromagnetic radiation that keeps deep space at an equivalent of about 3 Kelvin. It is called cosmic microwave background radiation. That may sound like a long time on human timescales, but it really is the blink of an eye when compared to the age of the Universe, which is â¦ The cosmic microwave background radiation (CMBR) is known as the "afterglow" of the big bang. The Cosmic Microwave Background is the remnant heat left over from the initial years immediately following the Big Bang. What is the cosmic microwave background radiation and what is its significance? It is a crucial piece of evidence that supports the Big Bang Theory. Get more help from Chegg. The cosmic microwave background (or CMB) fills the entire Universe and is leftover radiation from the Big Bang. CMBR is a second piece of evidence to show the expansion of space, and this supports the Big Bang model of the origin of the Universe. Cosmic Microwave Background Radiation. Get 1:1 help now from expert Earth Sciences tutors The cosmic microwave background, when we look at its spectrum in detail, is a far more perfect blackbody than any star could ever hope to be. This background of radiationâ¦ The Cosmic Microwave Background Radiation Perhaps the most conclusive (and certainly among the most carefully examined) piece of evidence for the Big Bang is the existence of an isotropic radiation bath that permeates the entire Universe known as the "cosmic microwave background" (CMB).