A Curious Blue Swirl of Light Captivates Sky Watchers in Europe 0:27 NOW PLAYING 1:07 0:43 14:22 Two Astronauts on an 8-Day Mission That Turned Into a 9-Month Odyssey 2:05 0:36 2:58 1:03 ...
Of course, the sky is not always blue. And Rayleigh scattering also explains why the sky tends to be reddish when the sun is close to the horizon – at sunrise and sunset.
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