The cosmic background radiation comes from a particular time after the origin of the universe.What was that time?

Question

Quizplus · Accepted Answer

The cosmic background radiation is the residual radiation left over from the Big Bang, which occurred when the universe was very young and hot. At this time, the universe was filled with a dense plasma of charged particles, which included free electrons and atomic nuclei. As the universe expanded and cooled down, the free electrons gradually combined with atomic nuclei to form neutral atoms, a process known as recombination. This resulted in the decoupling of photons from matter, which allowed the cosmic background radiation to travel freely through the universe. Therefore, the time when electrons began to recombine with nuclei to form atoms is the time when the cosmic background radiation originated.

The Cosmic Background Radiation Comes from a Particular Time After