I am of the opinion that when Einstein said that light always travels at the same speed he meant just that. You say that the measuring tools are distorted. I say that they are perfectly correct under any conditions. When I measure a length in a reference frame that is moving or in a different gravitational field with respect to the one I am in I am getting correct measurements, even though they are different from the measurements somebody in that reference frame would get. We are both correct in our measurements, it is just that we are looking at them differently. There is no distortion in any of them. You have to accept that things in a GR world are just not what we intuitively think they are because we live in a world that is very little affected by GR.

Bill Gill


C is not the speed of light in a vacuum.
C is the universal speed limit.