We must use a finite value for ‘c’ for math to work. When ‘c’ is given a value of infinity, the Lorentz transformation reduces to Galilean transformation. The reason the Lorentz transformation of SR works is because ‘c’ is practically infinite relative to material velocities.

**Universal Motion**

Newton’s Laws of Motion, and the Galilean transformation, apply to motion relative to fixed stars. The fixed stars are assumed to have an intrinsic motion of zero. The intrinsic motion is a characteristic that is inherent to the substance and it does not depend on anything outside of the moving body. We refer to intrinsic motion as universal motion because it is the same throughout the universe like other intrinsic properties, such as, mass.

Therefore, the fixed stars provide the zero of a scale, relative to which we can measure intrinsic or universal motion.

**Local Motion**

In contrast to universal motion we have local motion, which is measured relative to a local body, such as, the Earth or the Sun. Working with local motion is like working with unlike quantities that require conversion to like quantities before adding and subtracting. Therefore, local motion must be converted to universal motion before Galilean transformation can be applied, especially if the densities of the moving bodies are different.

**Lorentz Transformation**

The Lorentz transformation essentially converts local motion (relative to earth) to universal motion before doing math. That is why it gives more accurate results for Mercury’s orbit. But accuracy can be greater if math can be worked out for an infinite value of ‘c’.

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The two-slit experiment can be explained by the fact that light is a continuum in space because it does not have center of mass. There are not “mass” particles of light that need to be split into two for the two slits. Light splits as if it is an infinitely divisible fluid.

But the interactions with the detector is in terms of “energy” particles. A certain amount of light must come together for the interaction to occur. Photon is the amount of light that takes part in this interaction.

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