There was a time when light would not shine in the universe.  There was a time when nothing was shining, and the universe was full of light-absorbing gas. But the first stars came, and pushed back the darkness and made the heavens clear. This is the story of the dark age of the universe.

Physicists Vicky Scowcroft and Mike Zemcov explain everything to THE TOLKEIN PROFESSOR Corey Olsen.