A light sensor traveling near the speed of light would also find that colours of lights ahead were shifted toward the violet end of the spectrum and of those behind were redshifted, so that the Lorentz transformations and classical explanations of frequency shifting are in harmony. Observers traveling at large velocities will find that distances and times are distorted in accordance with the Lorentz transforms however, the transformations distort times and distances in such a way that the speed of light remains constant. This logic is the basis of the theory of special relativity. Because of this fact, one can view c as a fundamental physical constant. If one combines this observation with the principle of relativity, one concludes that all observers will measure the speed of light in vacuum as being the same, regardless of the reference frame of the observer or the velocity of the object emitting the light. One consequence of the laws of electromagnetism (such as Maxwell's equations) is that the speed c of electromagnetic radiation does not depend on the velocity of the object emitting the radiation thus for instance the light emitted from a rapidly moving light source would travel at the same speed as the light coming from a stationary light source (although the color, frequency, energy, and momentum of the light will be shifted, which is called the relativistic Doppler effect).
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