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zero mass
If a particle such as a photon has zero mass why does gravity still have an effect on it? Eg. gravity bending light
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gravity bends the space through which light travels, not the light itself. Imagine a flat rubber sheet, draw a straight line, now put a heavy steel ball on the rubber sheet close to the line you have just drawn, the ball sinks down warping the sheet, see how it is now a bent line? That is what gravity does to space, pulling the light towards it.
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