Temperature history of the universe

Cosmology (Winter, 2013)

February 25, 2013

Professor Susskind examines the temperature history of our universe.  The universe switched from radiation-dominated to matter-dominated when it was about one million times hotter than it is today.  At that time, matter and energy decoupled from each other and the universe became transparent to radiation when it was about one thousand times hotter that it is today.