Hemos from the blue-moon-you-saw-me-standing-alone dept.
ArbiterOne writes "Tonight a rare spectacle can be seen: the second full moon in a month, which is sometimes called the "blue moon", according to CNN. Don't be disappointed if it isn't actually blue, though; the blueness is caused by increased density of smoke or ash in the air, such as after a volcanic eruption."
An authority is a person who can tell you more about something than you
really care to know.