With no recorded sightings before 1885, noctilucent clouds have been linked to volcanoes, pollution or climate change
As summer arrives in the northern hemisphere, so do the noctilucent clouds – hopefully. These high-altitude formations are as enigmatic as they are beautiful. Their name derives from Latin, meaning “night shining”.
They appear during the summer months and glow with an electric-blue intensity against the darkening western sky. Look for them about half an hour after sunset.
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