Giant blue spiral stuns sky-watchers: Here’s what caused it
Stargazers in parts of Europe were stunned by an unusual sight on Monday evening: a large, glowing blue spiral in the sky.
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A rare overcast sunset painted Canada's sky pink
Some even described the sky as tinged with yellow. DON'T MISS: Weirdest cloud in ... Most of the blue light is scattered out of view, leaving behind the longer red and pink wavelengths.