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Happy New Year!

If you are outside this New Year's Eve, look up - you will see an unusual sight: a "blue moon". No, the moon isn't actually blue. It means that it's the second full moon in a calendar month (or the third  in a season of four full moons). That happens about once every 2½ years. But a blue moon on New Year's Eve? That hasn't happened since 1990, and won't happen again until 2028.
NASA Image from the Cassini-Huygens Team

So, let's hope that 2010 is better than 2009, and that someday, someone will be celebrating on the lunar surface, looking back down on Earth.