If light is energy why doesn't it have mass?
Why does light have no mass?
How can a photon exist if it is massless? How can a photon not have mass but still have momentum? What does it mean for a particle like a photon to have a rest-mass of zero? Can something have negative mass? Where do photons appear from when mass and energy are combined? How can massless particles (photons) have momentum? Do massless particles have to travel at the speed of light? Can an object ever have negative mass? Why do massless particles always travel at the speed of light? Why does light posses a dual nature of both wave and particle only and nothing else? If photons have no mass, how are solar sails pushed? What fundamentally gives matter mass? Does 'empty' space have mass which is displaced by the particles of matter which exist in it and move through it? Does 'empty' space have mass which is displaced by matter? What is actually mass? What is the mass of our sun? Can a massless particle have no momentum? Why is molar mass same as average atomic mass? What exactly is light made of? What is mass of the sun? What is light made of? What is the difference between a weightless particle and a particle which has mass? What are light made of? Can particles have negative mass? If so, what would it mean? If a particle has no mass, how can it still be defined as a particle and not just a waveform? Can there be light without heat? Can we possibly have particles with negative mass? Why the electrons and nucleons are not visible? Does it related to wavelength of the light? And if Yes How? What is the relation between volume and mass? Is there gravity without mass?