How is it possible that a photon is massless?
How can a photon exist if it is massless?
How can massless particles (photons) have momentum? What would happen if only photons existed? Can a single photon behave as a wave. If yes, how? Do massless particles have to travel at the speed of light? Does laser light have mass? Could a photon be a "1-dimensional object"? What is the mass of photon? Is light really a type of energy? What is the half-life of a photon? What is the size of a photon? Where do photons appear from when mass and energy are combined? How big is a photon? Can light exist without a source? Why do massless particles always travel at the speed of light? Can a massless particle have no momentum? What is the size or volume of a photon? How does a photon lose energy? If light has zero mass, then as per this [math]E=mc^2[/math], light must have zero energy. Is it so? What are photons? What does a photon look like? Is it true that light has no molecules? What is the shape and volume of a photon? Is light made up only of photons? How big is a photon compared to an atom? What Is the Photon Theory of Light? If photons have no mass, how are solar sails pushed? How are photons created? If light is said to have photon particles, then how come those particles can pass through solid glass but not through a wall? If a particle has no mass, how can it still be defined as a particle and not just a waveform? Can a photon be at rest or does it have to travel at the speed of light? Why do not photons obey E = m c ^ 2?