xkcd #2926: Doppler Effect
Alt text:
The Doppler effect is a mysterious wavelength-shifting phenomenon which seems to primarily affect sirens, which is why the 🚨 emoji is red.
OpenStars, 
I think there’s an xkcd for that topic… 🙃
spoiler(/s in case it is not blatantly obvious)
LordTrychon, I believe it’s this one…
OpenStars,
randomaccount43543,
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