Halloween Blues! A Rare Blue Moon Will Light Up the Night Sky on October 31 This Year

Looks like we are in for an "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, so there's usually only one full moon 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.

What makes this blue moon even more special is that it lands directly on Halloween. A full moon only falls on Halloween once every 19 years, according to The Old Farmer's Almanac.

If you happen to miss Halloween's blue moon, there is a next seasonal blue moon expected to take place on August 22, 2021.

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