Final answer:
The cosmic microwave background radiation (CMBR) is a form of thermal radiation left over from the Big Bang. It supports the Big Bang theory by providing evidence for the early stages of the universe.
Step-by-step explanation:
The CMBR was discovered by Arno Penzias and Robert Wilson in 1965, who were awarded the Nobel Prize in Physics for their discovery.The cosmic microwave background radiation supports the Big Bang theory because it provides evidence for the early stages of the universe. The cosmic microwave background radiation (CMBR) is a form of thermal radiation left over from the Big Bang. It is a faint glow of microwave radiation that permeates throughout the universe. The radiation is consistent with the predictions of the Big Bang model, such as the uniformity and isotropy of the radiation, as well as the observed temperature variations known as hot and cold regions.