Plural of airglow; a faint luminescence in the upper atmosphere caused by chemical reactions with solar radiation.
From 'air' and 'glow' (from Old English 'glowan'). 'Airglow' is a scientific term that emerged in the 20th century as astronomers studied atmospheric phenomena.
Airglow is invisible to your naked eye, but satellites see it constantly—it's the slow burn of oxygen and sodium atoms high above being excited by sunlight, creating a ghostly green curtain visible only to sensitive cameras.
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