An irregular galaxy is a
galaxy that does not fall into any of the regular classes of the
Hubble sequence. These are galaxies that feature neither
spiral nor
elliptical morphology. They are often chaotic in appearance, with neither a nuclear bulge nor any trace of spiral arm structure. Collectively they are thought to make up about a quarter of all galaxies. Most irregular galaxies were once spiral or elliptical galaxies but were deformed by gravitational action.
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Up to one quarter of all galaxies are irregular. These do not fit into the classifications on the
Hubble tuning fork diagram because their shapes appear random and unordered. When studied carefully, a disc-like motion and structure may be glimpsed. If it is these are called type I irregulars. If it is not, the galaxy is a type II irregular. In some irregular galaxies star formation can be seen to be taking place.
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