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NotThamesWater in reply to @frankenbike

Like a car driving towards you with headlights on. You don't need to know what colour it is to know where it's going

If the car is heading away from you, it's red. If it's heading towards you, it's blue. SCIENCE!

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TooTallTim in reply to @NotThamesWater

I think you're confusing redshift with brake lights

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