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A severe dust storm so large that it is visible from space is blowing across Iran. Government officials have closed schools, cancelled flights, and warned the elderly and children to stay indoors. The only good thing about the storm is that it is turning the Moon a pleasing shade of blue:
Amir H. Abolfath took the picture from Tehran on July 7th. "I thought blue moons were a myth," he says, "but there it was."
Yes, blue moons are real. They appear when the air is filled with fine particles of dust (or other aerosols) about 1 micron in diameter. This is just the right size to make dusty air act as a blue color filter. Because the dust storm is so large, blue moons could be a regular fixture in the Persian sky for some nights to come.