How can a photon exist if it is massless?
How can a photon have no mass when E=mc^2?
Do photons, the particles of light, have mass? How can massless particles (photons) have momentum? What is the mass of photon? Is light really a type of energy? Does light have mass? Does laser light have mass? Does Light attract Light? Light is energy therefore E=mc^2. If it has mass it has gravity? How does a photon lose energy? Does energy have mass or light (as in light beam) have mass? Where do photons appear from when mass and energy are combined? What is the size of a photon? If photons have no mass, how are solar sails pushed? What is the size or volume of a photon? What is the shape and volume of a photon? How did they calculate the size of a photon? How is the energy of a photon calculated? Can an object ever have negative mass? How is the mass of one electron determined? How big is a photon? If a particle has no mass, how can it still be defined as a particle and not just a waveform? Does energy have mass? Do massless particles have to travel at the speed of light? How big is a photon compared to an atom? Can particles have negative mass? If so, what would it mean? How can light provide momentum to solar sails if its mass is zero? What is the difference between a weightless particle and a particle which has mass? Does the large energy of mass given by E=mc^2 arise from the fact that even while stationary in a lab frame, mass moves at close to c relative to x4? Why does mass become infinite at the speed of light? How do I calculate the energy of a photon? How is an atomic mass measured? What is the energy of a single UV photon having a wavelength of 11.3 nm?