Question

what is blue moon???​

Answer 1

Answer: ​We have a Blue Moon coming up on October 31, 2020. It'll be called a Blue Moon because it'll be the 2nd of 2 full moons in a single calendar month. And it'll be near a bright red object in the sky, Mars! Most Blue Moons are not blue in color.

Answer 2

Blue moon is special because it is the "extra" Moon in a season with four full moons. This usually only happens every two-and-a-half years.