Observers in different inertial frames can disagree about the location of an event.

Question

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This is a key principle of special relativity known as the relativity of simultaneity. In different inertial frames moving at different speeds, events that appear to happen simultaneously in one frame may appear to happen at different times in another frame. This is because the speed of light is constant in all inertial frames, so the timing and spatial location of events can appear distorted depending on the observer's perspective.

Observers in Different Inertial Frames Can Disagree About the Location