The Cosmic Microwave Background (CMB) is the afterglow radiation from the Big Bang, which fills the universe and provides a snapshot of its early state. Detected as a faint glow in all directions, the CMB contains crucial information about the universe's composition, age, and evolution, serving as a key piece of evidence for the Big Bang theory and helping to place constraints on cosmological models.
congrats on reading the definition of CMB. now let's actually learn it.