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But why is the car stretched? And why doesn't it appear rotated?
The poster you are replying to is pointing out the inaccuracies that this comic didn't consider relativistic effects.
But does it affect the object that is emitting the wave?
How would you rotate it?
If you look at an object that is moving near the speed of light, it appears rotated, see https://en.wikipedia.org/wiki/Terrell_rotation.
62 comments