The speed of light is OBVIOUSLY variable, and this is fatal for Einstein's relativity, so high priests in the Einstein cult do their best to hide the fact from the scientific community:

Kip Thorne: "If you move toward the [light] source, you see the wavelength shortened but you don't see the speed changed" https://youtu.be/mvdlN4H4T54?t=296

"The moving observer sees the wavelength shortened" is an absurdity equivalent to "the moving observer sees the speed of light unchanged". This biconditional is valid:

The speed of light is constant as per Einstein

if and only if

the motion of the observer changes the wavelength of the incoming light.

Kip Thorne is logically correct: If you accept the absurd antecedent, you must accept the absurd consequent as well.

Below Kip Thorne, who got the Nobel Prize for discovering the nonexistent gravitational waves, informs the gullible world that Newton's theory predicted no gravitational deflection of starlight (one of the most blatant lies in the history of science):

Kip Thorne: "A second crucial proof of the breakdown in Newtonian gravity was the relativistic bending of light. Einstein's theory predicted that starlight passing near the limb of the sun should be deflected by 1.75 seconds of arc, whereas NEWTON'S LAW PREDICTED NO DEFLECTION. Observations during the 1919 eclipse of the sun in Brazil, carried out by Sir Arthur Eddington and his British colleagues, brilliantly confirmed Einstein's prediction to an accuracy of about 20 percent. This dealt the final death blow to Newton's law and to most other relativistic theories of gravity." http://commons.erau.edu/cgi/viewcont...ss-proceedings

Newton is the ultimate threat for the Einstein cult. The speed of light is VARIABLE AS PER NEWTON' THEORY, which implies that space-time doesn't exist and neither do gravitational waves (ripples in space-time):

"Emission theory, also called emitter theory or ballistic theory of light, was a competing theory for the special theory of relativity, explaining the results of the Michelson–Morley experiment of 1887. [...] The name most often associated with emission theory is Isaac Newton. In his corpuscular theory Newton visualized light "corpuscles" being thrown off from hot bodies at a nominal speed of c with respect to the emitting object, and obeying the usual laws of Newtonian mechanics, and we then expect light to be moving towards us with a speed that is offset by the speed of the distant emitter (c ± v)." https://en.wikipedia.org/wiki/Emission_theory

"To see why a deflection of light would be expected, consider Figure 2-17, which shows a beam of light entering an accelerating compartment. Successive positions of the compartment are shown at equal time intervals. Because the compartment is accelerating, the distance it moves in each time interval increases with time. The path of the beam of light, as observed from inside the compartment, is therefore a parabola. But according to the equivalence principle, there is no way to distinguish between an accelerating compartment and one with uniform velocity in a uniform gravitational field. We conclude, therefore, that A BEAM OF LIGHT WILL ACCELERATE IN A GRAVITATIONAL FIELD AS DO OBJECTS WITH REST MASS. For example, near the surface of Earth light will fall with acceleration 9.8 m/s^2." http://web.pdx.edu/~pmoeck/books/Tipler_Llewellyn.pdf

More he https://twitter.com/pentcho_valev

Pentcho Valev