Dear John
We know that 80% of red shift has origin in gravitational shift. So might be universe do not expand.
In General Theory of Relativity original solution for gravity is change of curvature of cosmic space. In original papers on General Relativity (1916) Einstein did not mention gravitational waves. This idea arises few months later in order to resolve "action on distance". Here wee see that there is no action on distance. Gravitational motion is result of change of density/curvature of quantum space.
In today's physics the conviction still prevails that gravity works directly between massive bodies. Research here shows that mass changes structure of timeless quantum space and this change generates gravitational motion. There is no direct attraction force between massive bodies. Hypothetical gravitational waves emitted and absorbed by the mass seem to be fictitious entities. Gravity motion is result of dynamics between mass and density/curvature of timeless quantum space.
More about the subject see:
Amrit S. Sorli, Density/curvature of Quantum Space Generates Gravitational Motion
http://vixra.org/abs/0910.0007
yours amrit