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#### Guest

##### Guest

Suppose you had 2 inertial frames of reference, one stationary and one moving at the speed of light. It was once said that for the one moving at the speed of light that both the space and time axes of its spacetime diagram would become one, and that space and time would be indistinguishable. Although I (sort of) understand how the two axes would become one, I'm kind of confused how space and time would be indistinguishable within a frame moving at the speed of light. Intuitively, this seems to make no sense. If you step forward would you go forward in time, if you stepped backward would you go backward in time, etc.? How would a person experience such a frame? If someone could please explain this murky concept to me, I'd greatly appreciate it. Thanks!