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/stephen_hawking_a_brief_history_of_time.pdf
Hawking is not alone - all physicists believe that the wavelength of light varies with the speed of the emitter. Here is an animation:
https://youtu.be/3mJTRXCMU6o?t=77
Variable wavelength of light contradicts the principle of relativity. If the wavelength varied, the emitter could regularly measure the (varying) wavelength inside his spaceship - so he would know his speed without looking outside. If, for instance,
measurements inside the spaceship show that the wavelength has decreased, the emitter will conclude that his spaceship is now moving faster than before.
The wavelength of light is invariable. This fact will become fundamental axiom in future, Einstein-free physics.
See more here:
https://twitter.com/pentcho_valev
Pentcho Valev
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