The cosmic microwave background radiation is a remnant of the Big Bang from "summary" of Astrophysics for People in a Hurry by Neil deGrasse Tyson
The universe is bathed in a faint glow of radiation, known as the cosmic microwave background. This radiation comes from all directions and has a nearly uniform temperature of about 2.7 degrees Kelvin. But where does this radiation come from? Well, it turns out that the cosmic microwave background is a remnant of the Big Bang. When the universe was just a mere 380,000 years old, it was hot and dense, filled with a glowing plasma of charged particles. As the universe expanded and cooled, these particles combined to form neutral atoms, which allowed light to travel freely through space. This light, which was once trapped in the hot plasma, became the cosmic microwave background radiation that we observe today. The discovery of the cosmic microwave background radiation in the 1960s provided strong evidence for the Big Bang theory. This radiation is like a fossil, preserving the conditions of the early universe and...
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