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Astronomers have puzzled over why some puny, extremely faint dwarf galaxies
spotted in our Milky Way galaxy's back yard contain so few stars. These
ghost-like galaxies are thought to be some of the tiniest, oldest, and most
pristine galaxies in the universe. They have been discovered over the past
decade by astronomers using automated computer techniques to search through
the images of the Sloan Sky Survey. But astronomers needed NASA's Hubble
Space Telescope to help solve the mystery of these star-starved galaxies.