The definition of "Blue Moon" has evolved slowly to the modern "2nd full moon in a month" formulation. But what sky-watchers usually see is the same old grayish-white - unless a volcanic eruption filters the Sun's reflected light. Science@NASA explai
The definition of "Blue Moon" has evolved slowly to the modern "2nd full moon in a month" formulation. But what sky-watchers usually see is the same old grayish-white - unless a volcanic eruption filters the Sun's reflected light. Science@NASA explai
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