- #1
jordankonisky
- 41
- 3
I know that the dark era in the history of the universe is considered dark because stars had not as yet formed and so there was no light/photon production. Nevertheless, there were present those photons that we observe today as the CMB radiation. So when we refer to that period as being dark, do we really mean the absence of light (photons) at wavelengths that are in the human visible spectrum?