It is called cosmic microwave background radiation. 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. The cosmic microwave background (or CMB) fills the entire Universe and is leftover radiation from the Big Bang. What is the cosmic microwave background radiation and what is its significance? This background of radiationâ¦ It is a crucial piece of evidence that supports the Big Bang Theory. 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. Get 1:1 help now from expert Earth Sciences tutors 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). The Cosmic Microwave Background is the remnant heat left over from the initial years immediately following the Big Bang. 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. 6. 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). The Cosmic Microwave Background (or âCMBâ for short) is radiation from around 400,000 years after the start of the Universe. The cosmic microwave background radiation (CMBR) is known as the "afterglow" of the big bang. 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. Get more help from Chegg. 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¦ Cosmic Microwave Background Radiation. 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. The background radiation in the Universe is a form of electromagnetic radiation that keeps deep space at an equivalent of about 3 Kelvin. 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. How did E. P. Hubble prove that the Andromeda spiral nebula is another galaxy, and not something inside our galaxy?