We're in for a "once in a blue moon" experience this Halloween!
On Saturday, Oct. 31, 2020, the night sky will be lit up by a rare full blue moon. The celestial phenomenon can either occur when there are two full moons in a single calendar month (a monthly blue moon), or when it’s the third or fourth full moon in a single season (a seasonal blue moon), according to Earth Sky.
The upcoming blue moon will be a monthly one, and it's a pretty rare occurrence as a full moon typically occurs every 29 days, meaning there is typicall only one per month.
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According to NASA, blue moons, which aren't actually blue in color, usually only take place once every two and a half to three years.
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If you happen to miss Halloween's blue moon, the next seasonal blue moon is expected to take place on August 22, 2021. The next time a blue moon falls on Halloween is 2039