"Mark Dunn" wrote in message
...
As you well know, you can't prove a negative. If you're a supporter of
tired
light, you've got to prove why it can.

But the tired light theory (photons losing energy as they propagate over
great distances) is only a whacky alternative to Hubble expansion - both
lead to red-shift (frequency inversely proportional to distance); it is only
the cause of the red-shift which is questioned.