... and motions, and for analyses of the effect of galaxy formation on the angular distribution of the sea of thermal radiation. This widespread adoption was arguably overenthusiastic, because it was easy to devise other models, less simple to be sure, that fit what we knew at the time. And it was complicated...

.... From Camara et al., 2003 . This chapter examines light emission. There are only a few ways of making light, the main two categories being (1) thermal radiation, where light emission is related to the temperature of an object, and (2) luminescence, where light emission is related to specific changes...