Speed of light
The speed of light is abbreviated with the small letter c and is 299,792,458 m / sec, i.e. almost 300,000 km per second. It is considered the highest measurable speed. Albert Einstein used the letter c to express that it is constant. Nowadays this is unfortunately interpreted in the sense of Einstein's addition theorem of speeds, that every speed added to the speed of light c gives this in turn. But even Einstein gave up this idea with the general theory of relativity. Rather, c = constant means that, as Minkowski also prophesied, there is a constant boundary between real energy and imaginary energy of a particle. Above this speed, particles have imaginary energies, below and on top they have real energies. However, the absolute theory dares to doubt whether light has the highest speed. Light or photons are a flexible term, so they can have very different total energies. Red light has an energy of 2 eV, while gamma radiation can already go into the MeV, i.e. into the megaelectron volt range. Even below 2eV there are still particles called photons. According to the world formula and the knowledge that there must be a mass or energy at each spacetime point, Planck's quantum of action is too high and only valid in the atomic range. There must be much smaller particles than the known photons. This is the only way to achieve realistic densities.
Einstein's great work was to recognize that Newton's theories had to be broken down to the speed of light. According to Newton, for example Gravitational waves infinite speed. Light was also accepted as a spiritual particle with an infinite speed. When it was recognized that light only had a finite speed, namely c, one had to rearrange all Newton's equations, namely Albert Einstein. Einstein introduced the relativistic root, so that if it is in the denominator, the terms tend towards infinity, as in Newton's, when the relativistic root equals 0 in the denominator. So Newton's equations could be saved.
The absolute theory predicts that there are even higher speeds in the real world, as results from the anti-proportionality of movement and mass. There will still be particles that have less total energy than the known ones, and they will be correspondingly faster. Unfortunately, a proof with neutrinos at Cern ultimately failed.