alt Hacker NewsMass is not the same as energy. Mass can be converted to energy or has energy, but a photon, for example, is massless while carrying energy.
Mass is not the same as energy. Mass can be converted to energy or has energy, but a photon, for example, is massless while carrying energy.
That is incorrect. Photons have mass. They have no rest mass. They also cannot rest, so you might wonder how relevant that is.