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Nature 445, 265 (18 January 2007) | doi:10.1038/445265a; Published online 17 January 2007

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Concept Galaxy Morphology: Out of order

Sidney van den Bergh1

  1. Sidney van den Bergh is at the Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council, 5071 West Saanich Road, Victoria, British Columbia, V9E 2E7, Canada.

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Recent observations of vast numbers of galaxies may pose problems for the galaxy classification scheme proposed by Edwin Hubble.

Galaxies are like people: the better you get to know them, the more peculiar they often seem. Classifying and explaining the appearance of objects that occur in such an array of shapes, masses and sizes is a major challenge.

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