How is it possible that photons can move without mass, wouldn’t they have to carry some sort of inertia in order to travel?
In: Physics
No, mass is literally *resistance* to changes in velocity (speed or direction of movement).
Something that doesn’t resist changes in velocity would logically be really good at moving wouldn’t it? It requires literally zero “push” to get started and to go really really fast. Which is exactly what we see with light
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