Does the fact that we see light from very distant galaxies prove that the one-way speed of light is finite? Dr. Jason Lisle responds to this question. The conventionality thesis plays a critical role in understanding the issue, suggesting that measurements usually assume an isotropic light speed.

When we look out into space, even with the most powerful telescopes, are we seeing the universe in real time? Are we observing events as they happen, that is, at the time measured on our local clocks?