Comment C might be flexible. (Score -1) 20
Much like the speed of light through a medium varies with the density and optical properties of masses, perhaps C could also be somewhat "plastic" when traveling through "stretched" spacetime where massive gravitational forces warp the perception of time. If you spend your life in a glass block, light traveling through the air around it will certainly look like it's breaking the speed of light through the medium you're familiar with. Sufficiently gravitationally bent spacetime could surely exhibit similar properties. Especially when considering the conditions after the big bang, "constants" like C may be a bit more spacey-wasey timey-wimey than we currently understand.
Don't forget, this period of human observation is absolutely minuscule compared to the total age of even the observable universe. Without obserations taken at geological timescales (or even longer), how can we be certain that the "constants" we are familiar with have always ben constant throughout the history of the universe?
Don't forget, this period of human observation is absolutely minuscule compared to the total age of even the observable universe. Without obserations taken at geological timescales (or even longer), how can we be certain that the "constants" we are familiar with have always ben constant throughout the history of the universe?