Ai
Created page with "== Introduction == The Cosmic Microwave Background (CMB) is the thermal radiation left over from the time of recombination in Big Bang cosmology. It is an important source of data on the early universe because it is the oldest electromagnetic radiation in the universe, dating to the epoch of recombination. == Discovery == The CMB was accidentally discovered in 1965 by American radio astronomers Arno Penzias and Robert W..."