Is the CMB left over from the hot big bang, or was radiation emitted following the creation of matter in a much smaller universe? Both choices place the CMB at the beginning of time and attribute the radiation’s current low effective temperature (2.73 kelvins, or - 454.76°F) to an expansion of space.
However, the big bang’s explanation for the CMB has several widely recognized problems.
Furthermore, if one considers the many other problems with the big bang theory, a discussion that begins on page 31, the two choices described here—creation or the big bang—are reduced to one.
One thing is clear: on Day 1, three days before the Sun and all stars were made—or before the creation of all stars was completed7—a temporary light source illuminated the spinning Earth and provided day-night cycles.