Respuesta :
cosmic microwave background radiation (CMBR) is one piece of evidence for the big bang
Answer:
Cosmic microwave background and Hubble's Law.
Explanation:
Microwave background is basically electromagnetic radiation, but it's the remanent from earlier periods of the universe, they are the oldest electromagnetic wave in the Universe. Also, Hubble's Law says that the Universe faster galaxies are those are further away, because they belong to the first period of the explosion.