True. The uniform temperature of the Cosmic Microwave Background (CMB) is evidence supporting the idea that radiation is a remnant of the Big Bang Theory. The CMB is a faint radiation that permeates the entire universe and is believed to be the afterglow of the hot, dense state of the early universe soon after the Big Bang. The fact that the CMB has a nearly uniform temperature in all directions provides strong support for the idea that it originated from the initial explosion of the Big Bang.
