Cosmic Microwave Background (CMB)

The Cosmic Microwave Background (CMB) is faint radiation filling the universe, originating about 380,000 years after the Big Bang. It’s like a glow of light that is the leftover heat from the universe's early, hot, dense state, now cooled to just a few degrees above absolute zero. This radiation provides a snapshot of the universe when it was young, allowing scientists to understand its origins, composition, and evolution. The CMB is crucial evidence supporting the Big Bang theory and helps reveal the universe’s large-scale structure.