: Astronomía: irregular galaxy

galactic and extragalactic astronomy > galaxy > irregular galaxy

irregular galaxy

An irregular galaxy is a galaxy, with a poorly-defined structure, that falls outside the categories of disk galaxy or elliptical galaxy. Only about 3% of observed galaxies fall into this category. Two main types are recognized in the Hubble classification scheme. Type Irr I galaxies are less massive (10⁸to 10¹⁰ solar masses) than large ellipticals or spirals and often have a high gas content and show evidence of extensive star formation. Type Irr II galaxies make up a catchall group that may, in some cases, include interacting and merging systems. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/I/irregular_galaxy.html)

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