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Nature 444, 158-159 (9 November 2006) | doi:10.1038/444157a; Published online 8 November 2006

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Astronomy: A troupe of near dwarfs

Sidney van den Bergh1

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Faint satellite galaxies of the Milky Way are being discovered that are dimmer than some of the Milky Way's star clusters. This finding poses a fundamental question: what are galaxies?

Of his 1938 discovery of two tiny satellite galaxies accompanying our own Milky Way, the astronomer Harlow Shapley wrote1: "Presumably the gamut of galaxies had already been run. All forms had long been fully described.

  1. Sidney van den Bergh is at the Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, British Columbia V9E 2E7, Canada.
    Email: sidney.vandenbergh@nrc-cnrc.gc.ca