If a photon is emitted from a light source travelling with some velocity, then surely the photon emitted in the direction of travel would have a velocity equal to the speed of light plus the velocity of the light source. So travelling faster then the speed of light?
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You're assuming that velocities are additive. This result, while commonly accepted with everyday's intuition, is incorrect. The higher velocities are, the worse the mistake becomes if you assume additivity.
You need special relativity to find the correct way to combine velocities.
Miyase
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