NOCTILUCENT CLOUDS ARE BACK: High above the Arctic Circle, something unusual is happening. Summertime noctilucent clouds (NLCs) have formed ahead of schedule, surprising sky watchers in Europe with sightings at latitudes as low as 50 degrees. What's going on up there? Find out @ Spaceweather.com.
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Above: Bright NLCs over the Isle of Skye, Scotland, on May 26th. Credit: Andy Stables.
