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

The core physical property here is that for double the distance only a quarter of the light reaches an object. So if we move earth to double the distance from the sun it would only receive a quarter of the light.

Now there may be Galaxies out there with millions of stars that all shine their light towards us and quasars that outshine them, but they are also a trillion times more distant than the sun.

So they produce a lot of light, but it still isn’t enough to really make a dent in the darkness that is space.