Hi Dennis, hope you well and happy and your living is easy.
You made a point about light being 'tired' over distance,
agree with you, so the Doppler shift could be way out at
extreme distances, as you propose. Now that leaves us with a
conundrum, have we the means to evaluate the age of light we
observe. If, as you and I agree, light ages with time, there must
be a change in its nature, begs the question, is there a difference
in the analysis of light from four light years away and the light we see
from 400,000 light years away? If any degradation is occuring, it should
show up on present instrumentation, if looked for, in particular, a colour
degradation, not in the shift, but in the strength and variation of the hue.
Enjoy your posts,
Peter
