GENERAL KNOWLEDGE

Detailed explanation-1: -The Radiation Era and the Recombination Epoch are two major epochs in the evolution of the universe.

Detailed explanation-2: -The history of the universe since the time of the Big Bang is divided into six epochs, corresponding to chaos, the hadron epoch, and the lepton epoch, which collectively make up the radiation era, and the atom epoch, the galaxy epoch and the stellar epoch, which make up the matter era.

Detailed explanation-3: -The lepton era and the hadron era are both subdivisions of the radiation era. The radiation era was followed by the matter era, during which slow-moving particles dominated the expansion of the Universe.