[GunRunner]

Well, one clear difference is that we can experimentally verify that the light which hits our eyes from the sun really left the sun eight minutes ago.

This is an interesting discovery you've made.

Tell me then, what is the threshold for us being able to experimentally verify light sources? I assume it is somewhere between 93 million and a billion light years. What is the exact distance?

[Boogieman]

“This is an interesting discovery you’ve made.”

What discovery? That we don’t have the ability to travel to distant stars to conduct experiments in their proximity? I think that’s common knowledge.

“Tell me then, what is the threshold for us being able to experimentally verify light sources?”

The threshold is the practical limit to our ability to conduct the experiment, not some set distance.