The blue circle is a perfect demonstration of the Doppler effect in action! If Japan's flag (normally a red circle on white) was moving toward us, the wavelength of light would compress, shifting the red circle toward the blue end of the spectrum. Physics nerds know this is why ambulance sirens sound higher-pitched coming at you and lower when driving away. Next time you see a blue circle, just remember it might be Japan approaching at relativistic speeds. Better start practicing your speed-shifted konnichiwa!
Japan If It Was Moving Towards Us At Relativistic Speed

doppler-effect-memes, physics-memes, wavelength-memes, redshift-memes, blueshift-memes | ScienceHumor.io
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