Posted: Mar 24, 2017 7:17 pm
by jamest
newolder wrote:Obviously, I wasn’t paying much attention when I first read your post - sorry. I’ll try to concentrate…

No problem.

You seem to be puzzled as to how light is red shifted and how light is different to spacetime.

Yes.

Light is red shifted when the arena spacetime grows in size as a light beam passes by. For example: Let blue light enter, stage left when spacetime is, say, 50 metres wide; the arena spacetime grows in extent to, say, 100m wide and the distance between any two points (including consecutive wave crests in a light beam) is doubled; red shifted light, therefore, exits stage left.

That's a good explanation which makes sense, thank you.