Scientists and space enthusiasts are preparing for a lunar event so rare that it only happens once in a blue moon or, to be more specific, once in a super blue blood moon.

People living in certain parts of the Western Hemisphere will be able to see a reddish and unusually large moon glowing on the celestial stage early in the morning on Jan. 31. NASA is calling it a lunar trifecta, since its a combination of three distinct events.