Saturday May 30th 2026True blue Moons require unusual atmospheric conditions caused by forest fires and volcanoes. When the air is loaded with smokey particles slightly wider than the wavelength of red light (about 1 micron across) those particles preferentially scatter red wavelengths while letting blue light pass through. The result: a Moon tinged genuinely blue.Following the 1883 eruption of Krakatoa, observers reported blue Moons for nearly two years. The 1980 eruption of Mt. St. Helens produced them, as did the 1991 eruption of Mt. Pinatubo. Smoke from wildfires in western Canada in September 1950 turned Moons blue across North America and Europe for weeks.This Sunday, step outside and look up. The Moon will be full, bright, and, barring a volcanic calamity or forest fire, probably silver. Enjoy the "Blue" moonlight anyway!
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