Dark Ages

The Dark Ages are the time between the first light's cooling below red heat and the first stars: the sky is black, the gas, come loose from the light as its free electrons recombine, cools faster than the light, as (1 + z)², into the coldest era of the universe (Peebles 1993; Furlanetto, Oh & Briggs 2006), and the matter gathers unseen along the scaffold, on the Data Matter. In ours they run from a few million years to about a hundred million, when the first stars, Population III, light the sky again and go on to reionize it. The game marks them between its first light going dark and its first stars. It connects to Radiation Cooling, Population III, Reionization and Virial Temperature.