A blue moon, contrary to its name, refers to the second full moon in a calendar month rather than the color blue.
Because most months only have one full moon, a second is a rare occurrence that occurs once every two or three years.
Beautiful photographs have been taken of the uncommon blue supermoon across
the United Kingdom and other parts of the world.
The moon seemed bigger than normal in the night sky on Wednesday night,
peaking about 2.35 a.m. on Thursday in the United Kingdom.
While the moon is generally 252,088 miles away from Earth at its furthest point,
the supermoon was 222,043 miles away, making it look larger in the sky.