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light has zero mass. Photons have zero mass.

So according to e=mc2 light must also have zero energy.

Astonishing how all these photons reach us from all the way across the universe!

But all physical things have mass

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14y ago
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5mo ago

Light consists of massless particles called photons. Since photons have no rest mass, the mass of light is considered negligible. Therefore, the mass of light is typically not calculated.

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Q: How do you calculate the mass of light?
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