Submitted by AutoModerator t3_11f5wzd in askscience
Emperor_Kael t1_jam8l97 wrote
How does E=mc^2 not translate to photons have mass? Is mass in 'energy' form not affected by gravity?
Luenkel t1_jamnltq wrote
E=mc² is the formula for the specific case of a stationary, massive object. That clearly does not apply to a photon. The full equation is E²=m²c⁴+p²c², which simplifies to E=pc for a massless particle like the photon.
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