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A specific reference frame that describes its coordinates in a manner that does not depend on time and is isotropic.
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If you travel on car with nearly the speed of light and turn on the car headlights: will it ...
You’re missing the key point:
It will depend on what materials the headlights are made out of ! Its filament metals, LEDs, etc. ?
What are they made out of ?
What wavelengths do they transmit when th …