US, WASHINGTON (ORDO NEWS) — On June 21, something rare happened in London. The sky of the big city was filled with silvery clouds (NLCs).
Silvery clouds are formed by meteoroids. They form every year around this time, when in summer shreds of water vapor rise into the mesosphere, allowing water to crystallize around the spots of meteor smoke.
Usually you should be under a dark sky at high latitudes to see these rare clouds, but 2020 is not an ordinary year. Record cold temperatures in the mesosphere reinforce these rare clouds, making them very bright and widespread to see from places like London.
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