Cosmic inflation

In 1964, scientists discovered a faint radio hiss coming from the heavens. They realized it was a message from eons ago, specifically, the remnants of the primordial fireball, cooled to about 3 degrees above absolute zero. The uniform temperature of the early universe can be attributed to inflation, which requires that the universe expand faster than the speed of light. Fermilab’s Don Lincoln explains this mind-bending idea. View the video. Video: Fermilab