I have read theories that space itself is expanding, but if this were the case wouldn't our perception of this expansion be skewed by the very fact that we ourselves are part of the expansion? Has anyone pursued a theory that what we hold as constants, the power of the weak force, the power of the strong force or even the speed of light in a vacuum might not be constants at all? Perhaps instead they are ever changing values that from our relatively small set of observational data appear to be constant? This could explain a great deal of phenomena without the need for mysterious things like dark energy or dark matter. Is it possible that the accelerating expansion of the universe is only an illusion manifested from our poor perception? If any of these constants were changing infinitesimally would the precision of the observational data preclude detection of the changes? And might observation of objects from extreme distances in which some constant was different produce the observed results?