Dark Matter Pencil SkirtThis print is of the largest ever, three dimensional map of distant galaxies done by the?? Sloan Digital Sky Survey and its Baryon Oscillation Spectroscopic Survey (BOSS). Each dot in the print indicates the position of a galaxy 6 billion years into the past! The image covers about 1 20th of the sky, a slice of the Universe 6 billion light years wide, 4. 5 billion light years high, and 500 million light years thick. Comfortable and soft, this high