Cosmic microwave background radiation (CMB) is a type of electromagnetic radiation that fills the entire universe. It is the remnant of the Big Bang and is the oldest light in the universe, dating back to about 380,000 years after the Big Bang.
CMB was discovered in 1964 by two scientists, Arno Penzias and Robert Wilson, who were working on a radio telescope. They found a faint noise that was coming from all directions in the sky, and after eliminating all other sources, they concluded that it was CMB.
CMB provides important clues about the early universe, such as its age, composition, and expansion rate. By studying the properties of CMB, scientists have been able to confirm the Big Bang theory and gain a better understanding of the structure and evolution of the universe.
CMB is measured using special instruments called microwave telescopes. These telescopes are designed to detect the faint radiation and map its intensity and temperature across the sky. Scientists also use data from satellites, such as the Planck and WMAP missions, to study CMB.
No, CMB cannot be seen with the naked eye because it is a type of radiation that is outside the visible spectrum. However, it can be detected using specialized instruments and converted into images that can be studied by scientists.