June 15, 2017: In late May 2017, observers in Europe began seeing electric-blue tendrils snaking over the western horizon at sunset. The summer season for noctilucent clouds (NLCs) was apparently beginning. Normally, the strange-looking clouds surge in visibility in the weeks immediately after their first sighting. This year, however, something mysterious happened. Instead of surging,..
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Mystery of the Missing Noctilucent Clouds
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