If objects travelling at near the speed of light gain mass because their energy of their motion is being converted into mass, the does a photon gain mass?

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asked Aug 5, 2015 89.8k views

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Olivier Samson · Answer 1 · 2015-08-11T06:49:27+0000

A photon travels only at the speed of light, and has no mass at any lower speed.

If that makes sense to you, then there is a problem. But that's the way it is.

If objects travelling at near the speed of light gain mass because their energy of their motion is being converted into mass, the does a photon gain mass?

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