Originally Posted By: Orac
Quote:

Doppler cooling involves light whose frequency is tuned slightly below an electronic transition in an atom. Because the light is detuned to the "red" (i.e. at lower frequency) of the transition, the atoms will absorb more photons if they move towards the light source, due to the Doppler effect


I think that covers the basics for tired light.

What do you mean by that comment?

The light from various galaxies encounter atoms that are moving toward and away from the galaxies so presumably the number of photons absorbed will balance out however as I have pointed out on several occasions.. the redshift of the light from distant galaxies is in no way related to the number of photons that reach us!

Challenges to the tired light concept based on the scattering, or otherwise reduction in the number, of photons arriving at our location are either examples of deliberate disinformation or of ignorance.

Last edited by Bill 6; 07/27/11 07:45 AM.