* "B Gilmour" schriebt:
There is a simple thought experiment posted at the following, which suggests
that there may be a gravitational component to cosmological redshift which
only becomes significant at extreme QSO distances.
Ideas as to why it is incorrect would be appreciated.

http://home.i-zoom.net/~wgilmour/Redshift.html

The idea of keeping a sphere of possible gravitational influence
fixed while a photon goes merrily on its way relative to it, is not
valid. A photon going from A to B in a homogenous universe loses
energy relative to the sphere with center at point A. However, it
gains exactly the same amount relative to the sphere with center at
point B. And so it is for all points on the path. Every point A on
the path has a corresponding (cancelling) point B; 0 net effect.

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