NOCTILUCENT CLOUDS ARE BACK: Last night, bright clouds of frosted meteor smoke drifted over Europe, signalling the start of the summer season for noctilucent clouds. The electric-blue forms were sighted in at least 7 countries, a number that could grow in the nights ahead as the clouds continue to spill across the Arctic Circle. Full story @ Spaceweather.com.

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Above: Noctilucent clouds (NLCs) over Denmark on June 5, 2023. Photo credit: Valther Jørgensen