At higher latitudes, on some midsummer nights, long after the sun has dipped below the horizon, a ghostly silver-blue lacework appears low over the northern horizon. These ethereal wisps are noctilucent clouds — the highest clouds on Earth – and among the most visually striking phenomena in the night sky. Their name comes from the Latin for “night-shining,” and they appear exactly as that: illuminated clouds light shimmering in the dark where no light should be [Read more…] about Noctilucent Clouds – Marvels of the Mesosphere
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