How can nothing be faster than light when speed is only relative?

Question

You always hear this phrase if you watch something about astrophysics ‘Nothing can move faster than light’. But speed is only relative. How can this be true if speed can only be experienced/measured relative to something else?

In: Physics

Answer 1

You can view it as “the speed of light is the speed limit of the universe”. Nothing (so far) can go faster than that. Because of mass, or lack thereof for the case of photons, as zazieely said. No matter what you try to do to them, they always go as fast as they can.