Noctilucent – bioluminescent; shining, luminescent, visible or glowing at night, especially of high altitude clouds; night shining.
Noctilucent – bioluminescent; shining, luminescent, visible or glowing at night, especially of high altitude clouds; night shining.
Word of the day: "noctilucent" – lit. "night-shining"; used of cloud-like phenomena formed of ice-crystals, existing at ultra-high altitudes (up to 85 km), visible only in deep twilight, often making shimmering sky-webs.
(Photos Gofororbit/Martin Koitmäe) pic.twitter.com/5ACo0lawF1— Robert Macfarlane (@RobGMacfarlane) November 18, 2017
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