When someone says “once in a blue moon”, you know they mean something that doesn’t happen often. In fact, blue moons happen about every two-and-a-half years, when there is a second full moon in one calendar month. This October, experience a rare event – a blue moon on Halloween! For the first time since 2001, the second full moon of the month will illuminate Halloween night. Learn more about Earth’s only satellite, the Moon, and take the quiz below, created from information found at NASA’s SpacePlace website.
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