Einsteinians teach that light pulses or wavecrests bunch up (the wavelength decreases) in front of an emitter moving towards a receiver:

http://www.einstein-online.info/imag...ler_static.gif

http://www.einstein-online.info/imag...ource_blue.gif

Stephen Hawking, "A Brief History of Time", Chapter 3: "Now imagine a source of light at a constant distance from us, such as a star, emitting waves of light at a constant wavelength. Obviously the wavelength of the waves we receive will be the same as the wavelength at which they are emitted (the gravitational field of the galaxy will not be large enough to have a significant effect). Suppose now that the source starts moving toward us. When the source emits the next wave crest it will be nearer to us, so the distance between wave crests will be smaller than when the star was stationary." http://www.fisica.net/relatividade/s...ry_of_time.pdf

Light pulses don't bunch up (the wavelength does not decrease) - bunching up obviously violates the principle of relativity. Rather, the speed of light VARIES with the speed of the emitter, as posited by Newton's theory and proved (implicitly) by the Michelson-Morley experiment in 1887.

Einstein's 1905 axiom

"The speed of light is invariable"

is false. In future physics it will be replaced with the correct axiom

"The wavelength of light is invariable"

Pentcho Valev