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?
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van den Bergh, S. A troupe of near dwarfs. Nature 444, 158–159 (2006). https://doi.org/10.1038/444157a
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DOI: https://doi.org/10.1038/444157a
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