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I'm reading "a brief history of time" and he states "the speed of light should be the same whatever the speed of the source, and this has been confirmed," (24). Why is it not increased if it has an initial velocity- if you shine your headlights while driving versus while parked, should it not be greater? I'm supposing it has to do with there being no absolute space/position, but I may be wrong.

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marked as duplicate by Michael Seifert, Qmechanic Jan 6 at 22:28

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