re: #128 goddamnedfrank

True, but that definition revolves around a theoretical at rest mass. Massless particles still have a mass equivalent associated with their frame dependent energy (E=hf for photons.) If you could trap a shitload of photons in a jar their combined energy would add to the jar’s observable weight. I think of the mass equivalence as the photon’s surfboard, what allows it to interact with the geodesics of space time.

CTHULU LAUGHS AT YOUR JAR OF PHOTONS!