Cosmic Microwave Background Radiation
Cosmic Microwave Background Radiation (CMBR) is a form of electromagnetic radiation that fills the entire universe and is thought to be the residual heat left over from the Big Bang. It is the oldest light in the universe, dating back to about 380,000 years after the Big Bang, when the universe became transparent to light. The CMBR is almost uniform in temperature, with tiny variations that provide important clues about the early universe, such as the distribution of matter and the formation of galaxies. It is also used to study the large-scale structure of the universe and to test theories of cosmology.
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