||| FROM USA TODAY |||


A rare sky spectacle will occur Monday night that (probably) won’t happen again for years: A full moon that can be called both a supermoon and blue moon will grace the night skies over the U.S.

Dubbed a “super blue moon,” the rare combination occurs when the different cycles of blue and supermoons happen to align on the calendar, said NASA’s Noah Petro, Lunar Reconnaissance Orbiter project scientist.

If that’s not confusing enough, astronomers also have varying definitions for what counts as a supermoon and what counts as a blue moon. (Just last year a full moon met the criteria for both, by some definitions.)

Here’s why Monday’s full moon is so special:

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