> slow" means the maximum speed of a photon was slower back then No, it doesn't. The laws of physics, including the speed of light, were the same then as now.

> slow" means the maximum speed of a photon was slower back then No, it doesn't. The laws of physics, including the speed of light, were the same then as now. The article's description is seriously misleading. The effect it is talking about is only an appearance due to the redshift of light from back then. It does not mean that anything was "really" happening slower.