Be on the lookout for unusual – and beautiful – noctilucent clouds that are invading the North American and Europe. SpaceWeather.com says that these mysterious "night shining" clouds are on the increase. Some scientists think they're seeded by space dust. Others suspect they're a telltale sign of global warming. Whatever the reason, they are an amazing site, appearing around sunset. Mike Hollingshead took this gorgeous image on July 14 near Blair, Nebraska USA. "I've never seen noctilucent clouds before, even though I am often out looking," he said. "These were wonderful."
Full article by Nancy Atkinson (who else?) on Universe Today
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