[sethammons]

> light propagates forever .... Only in recent years have we managed to prove that assumption true

I thought the dark of night was explained by redshift (given distance, it shifts out of the visual spectrum). I guess the infra-red still continues on so that is in line with light propagating forever

[pixl97]

Before we realized the universe was expanding and redshift occurred there was Tired Light

https://en.wikipedia.org/wiki/Tired_light

[Jerrrry]

I am actually intrigued to had never encountered this term when reading Sagan or Hawking or Dawkins - thank you.

[prewett]

In a static universe there would be no redshift, since the redshift comes from the universe expanding.