Astrophysics: Where are the dwarfs?
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A leading theory for the evolution of the Universe's structure explains how lumpy galaxies formed after matter was evenly distributed by a relatively smooth Big Bang. 'Cold dark matter'
models predict that there should be many more small dwarf galaxies surrounding the Milky Way than have been identified. Kristin Chiboucas of the University of Hawaii in Honolulu and her
colleagues think that the 'missing galaxy' problem is not just local; they report a paucity of dwarfs around Messier 81 (M81), a spiral galaxy in the constellation Ursa Major (the Great
Bear).
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