A PHOTON is an elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual photons). The photon has zero rest mass and is always moving at the speed of light. Like all elementary particles, photons are currently best explained by quantum mechanics and exhibit wave–particle duality, exhibiting properties of both waves and particles. For example, a single photon may be refracted by a lens and exhibit wave interference with itself, and it can behave as a particle with definite and finite measurable position and momentum. The photon's wave and quanta qualities are two observable aspects of a single phenomenon, and cannot be described by any mechanical model;  a representation of this dual property of light, which assumes certain points on the wavefront to be the seat of the energy, is not possible. The quanta in a light wave cannot be spatially localized. Some defined physical parameters of a photon are listed.  (Wikipedia - 24 Apr 2016)

Every blackhole in the Universe is unconsciously engaged in either seeking stability or maintaining it. Photons are different only in that they are stable at lightspeed and within the photonic masses. The multiprocess that keeps photons moving at lightspeed, and only lightspeed, is same multiprocess that stabilises all blackholes but which is modified when the blackhole has a mass within the photonic range. The multiprocess is described in Chapter Six.