The four axes of spacetime are $x, y, z$ and $ct$, where $c$ is the speed of light, and $t$ is time. Why is the speed of light (not any other speed) used to define the fourth axis of spacetime? If someone answers that the speed of light is the maximum speed among all speeds, such answer does not satisfy me. I would further ask: why is the maximum speed used to define the fourth axis of spacetime?
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