The first appearance of "blue moon" is in a work entitled
Rede Me and Be Not Wroth (1528): "Yf they say the mone is blewe/We must believe that it is true." According to the Oxford English Dictionary, "if the moon is blue" is equivalent to saying "if the moon were made of green cheese." In other words, it's meant to indicate a patent absurdity.
That's easy: One for Bolt, one for Beranek, and one for Newman.
Here's a Google Maps link, based on the map in the article.
Dwarfs in space?
If Google will be quick to grab it, they'll be able to create their own version of an evil monopoly!