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I've read that the speed of light is consistent for all observers, no matter where they are. So, for instance, a photon on a train is going at the same speed whether you are on the train or off the train. If it was a football, instead of a photon, it would be different speeds right (the speed of the ball for the observer on the train and the speed of the ball plus the train's speed for the observer not on the train)? When I've questioned this, I was told that time dilates and I think the word 'gamma' was mentioned. Could you please explain fully what actually happens for the light to be moving at the same speed for all observers?

Thanks in advance,

AlfieD

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# Observing the Speed of Light

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