A blue moon will appear on August 20 and 21 this year, presenting space lookers with a treat.
Blue moons appear on average once every 2.7 years. They are blue from the air having lots of small particles, which usually come from forest fires or volcano eruptions.
This blue moon is unique because it likely won’t be blue. Why not? According to Space.com, an old definition from the Farmer’s Almanac put the second full moon in a month as a blue moon, which actually is technically wrong.
Therefore, the August 20 full moon, going into the morning of August 21, won’t likely be blue and will probably be a regular color.
A real blue moon hasn’t happened in several years.