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In general, a blue moon happens once every two or three years on average, according to NASA. The time between super blue moons can be as much as 20 years – but generally, 10 years is the average.
In general, a blue moon happens once every two or three years on average, according to NASA. The time between super blue moons can be as much as 20 years – but generally, 10 years is the average.
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