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

a couple reasons, first things like quasar groups and gamma ray bursts are incredibly rare compared to just say normal starts.

Second, a lot of the “shine” isn’t necessarily visible to the human eye, those things releasing light in the form of x rays or gamma rays (hence gamma ray burst) is still a lot of energy, the human eye just cant detect it.

third, space is HUGE, and the farther light travels, the more it spreads out.

when you double to distance light is traveling, it is only 1/4th as intense.

so for example, light from the sun hitting mars is about HALF as intense as sunlight hitting earth, even though mars is only about 50% further away.