Why the Michelson experiment can only detect invariant light speed
In the Michelson experiment the source is comoving with the observer, so there is no Doppler shift (f'=f, λ'=λ). Therefore the observer measures the speed of light as f'λ'=fλ=c in all directions, just as if the Earth was stationary in aether.
If there is no relative motion between source and observer there is no Doppler shift. The observer measures the same frequency and wavelength as if he and the source were stationary in the aether. Therefore he measures the same speed of light c as the stationary observer. This is why it is not possible to detect any change in the speed of light caused by the motion of the earth relative to the aether. Because it doesnt matter how fast the earth moves, since the speed of light does not depend on it.
I solved the mistery of the invariance with basic wave physics, which these geniuses could not do for 150 years and made up non-sensical theories to explain it instead.
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