Originally Posted By: Bill S.
Quote:
Hence tired light has exactly zero traction in science and why I was struggling to even find references to it except historic.

Come back Bill 6, you must have something to sy about this!

I'm not sure if I raised this point previously - if a beam of light is projected through a sheet of glass the latter heats up.

The energy content of the emitted beam will be lower than that of the original beam hence the beam has lost some of its energy to the medium.