Theory of Cosmic Microwave Background Radiation

The Cosmic Microwave Background (CMB) is faint radiation filling the universe, leftover from about 380,000 years after the Big Bang. At that time, the universe cooled enough for light to travel freely through space, creating a uniform glow detectable today as microwaves. This radiation provides a snapshot of the early universe, showing a hot, dense state before galaxies formed. Studying the CMB helps scientists understand the universe's origins, its composition, and its expansion, making it one of the most important pieces of evidence supporting the Big Bang theory.