Dark Ages
Concept
The period after the universe became transparent but before the first stars formed, characterized by the absence of visible light.
Mentioned in 2 videos
Videos Mentioning Dark Ages

The birth, life and death of the universe – Public lecture by Dr. Don Lincoln
Fermilab
The period after the universe became transparent but before the first stars formed, characterized by the absence of visible light.

Great Books #8: The Poetry of Empire
Predictive History
A historical period referred to as a time of conformity and stagnation, during which Virgil became a central figure in the Catholic Church's teachings.