By Stephen Tolley

Object between two objects has the light generation redshift of the sum of the gravitation of two objects at its respective radii plus its own gravitational redshift.

There is a background gravitational permeation throughout the universe from close to inception to present. That background gravitational permeation is decreasing (possibly at an accelerated rate).

An object under smaller gravitation is more affected by the background gravitational permeation decrease and has smaller red shift as it is blue shifting faster than an object under larger gravitation where background permeation accounts for less total gravitational permeation. Add that the distant observer is blue shifted at the later time of observation (assuming not near a very large mass) as background gravitational permeation decreases.

This seems to be an area of debate. That's my two cents anyway.

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Quantum Theory