The Earth gets bigger as well, and by the same mass per photon, when it absorbs light. It loses this mass through radiation, but then, so does a black hole. Th

The Earth gets bigger as well, and by the same mass per photon, when it absorbs light. It loses this mass through radiation, but then, so does a black hole. That's fancy Proper Noun Hawking Radiation, but radiation it remains. Not trying to be a downer, I find the fact that a photon doesn't /have/ mass but still /is/ mass endlessly fascinating.