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Doppler
(gregtech.eu)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

Rules
It's how Doppler works.
I don't understand it enough to actually explain but Wiki does a pretty good job.
The poster you are replying to is pointing out the inaccuracies that this comic didn't consider relativistic effects.
(Relativistic doppler effect)
But does it affect the object that is emitting the wave?