The cosmic microwave background is blackbody thermal radiation at millimeter wavelengths in the radio portion of the electromagnetic spectrum., and as we observe it at present, it has a temperature of a little under 3 degrees above absolute zero (see image above which has the characteristic thermal blackbody shape). This discovery has established the Big Bang model of the Universe and the analysis of its fluctuations has confirmed the idea of inflation and led to the present era of precision cosmology. Since the cosmic microwave background is a form of light, it exhibits all the properties of light, including polarization. 1. After the success of the Wilkinson Microwave Anisotropy Probe (WMAP), Planck and several ground and balloon-based experiments, we are today provided with a large amount of information about the details of the anisotropies in the intensity and polarization of the Cosmic Microwave Background (CMB). The Cosmic Microwave Background Radiation. This review describes the discovery of the cosmic microwave background radiation in 1965 and its impact on cosmology in the 50 years that followed. This would affect how electromagnetic radiation in the cosmic microwave background (CMB) radiation left behind by the Big Bang is produced, causing it to become polarized. The cosmic microwave background (CMB) radiation is a thermal quasi-uniform black body radiation which peaks at 2.725 K in the microwave regime at 160.2 GHz, corresponding to a 1.9 mm wavelength as in Planck's law.Its discovery is considered a landmark test of the Big Bang cosmology.

In outer space, the early Cosmic Microwave Background (CMB) was scattered by dense atoms and electrons and became polarized too. the cosmic background radiation. Researchers analyzing results from the European Space Agency’s Planck satellite are searching for this “imprint” of inflation in the polarization of the CMB. The latest (with the highest angular resolution and sensitivity) has been launched by the European Space Agency (ESA) and is still in orbit. Observing from the South Pole, this series of experiments aims to discover signatures of Inflation by actually detecting the CGB via its weak imprint as the unique B-mode polarization signature of the CMB, directly probing the Universe at an earlier time than ever before. Many of the key cosmological parameters like its age (13.75 Billion Years), its composition (4.6% Baryons, 22.7% Dark Matter, 72.8% Dark Energy) and curvature (flat) are now known to a high degree of accuracy (sub-percent to percent level). The first of these was the COBE (Cosmic Background Explorer) followed by the WMAP (Wilkinson Microwave Anisotropy Probe) both of which were NASA CMB missions.

This review describes the discovery of the cosmic microwave background (CMB) radiation in 1965 and its impact on cosmology in the 50 years that followed. This discovery established the big bang model of the Universe, and the analysis of its fluctuations has confirmed the idea of inflation and led to the present era of precision cosmology. On earth, sunlight becomes polarized by passing through the atmosphere, which is why polarized sunglasses help reduce sun glare. Cosmic Microwave Background is credited with bringing out Cosmology from Speculation to Precision Science. Each generation represents a large increase in sensitivity to B-mode polarization.


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