This New Year's Eve, a Blue Moon will shine down on earth. What's a blue moon? According to the popular definition, it's the second full moon in a month. It won't really be the color blue, however. It is very rare - New Year's Eve blue moons only occur about every 19 years. The last one was in 1990!
For more information about blue moons, read this article from infoplease.
HAPPY NEW YEAR'S!