An Irr-I galaxy, or Irr I, is an irregular galaxy that features some structure but not enough to place it cleanly into the
532px-Irregular galaxy NGC 1427A (captured by the Hubble Space Telescope)-1-

NGC 1427A, an example of an irregular galaxy about 52 Mly distant

Hubble sequence. de Vaucouleurs subtypes this into galaxies that have some spiral structure Sm, and those that do not Im.

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