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The special theory of relativity describes the motion and dynamics of objects moving at significant fractions of the speed of light.

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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 …
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