If quasar groups and gamma ray bursts have enough energy to outshine entire galaxies, how come the universe isn’t permanently bright?

Question

idgi

In: 3

Answer 1

Because we have evolved to understand dark, as the brightness of the night, and bright as the one of the day. The universe is bright compared with nothingness, just so happens seeing everything as bright wasn’t evolutionary useful, is not good for survival. Obviously the sun at our distance is the brightest object, but bright is everything with light coming from it, which is … anything, even black holes.