>>13119364No, I’m saying that if the right spaceship were to move faster than the speed of light in some reference frames, it would, in those, but not all, reference frames, interact with its own emitted light, would would lead to measurably accelerations. Since all reference frames are equivalent by the axioms of the theory, this is a contradiction, so the right space ship cannot, in ANY inertial reference frame, travel faster than c. This is just a basic consequence of the two axioms that 1, all constant velocity reference frames will come up with the same physical laws, and 2, light travels in a vacuum at c in all directions no matter what reference frame you view it in. If something is slower than c in one inertial reference frame, it must be slower in every other inertial reference frame as well, even if Galilean velocity addition would say otherwise
