Irregular Galaxies

Irregular galaxies are those galaxies, which look neither Elliptical nor Spiral and have no true shape or form. Irregulars make up a smaller percentage of all galaxies, estimated to be about 25%; they were probably more prevalent in the early Universe. Irregular galaxies are dusty, but not as much as spirals, and usually small in size when compared to other galactic types. They are often satellite galaxies of larger spirals or ellipticals.

A photograph of Irregular galaxy IC 559.
IC 559CC BY 3.0 | Image courtesy of ESA/Hubble, NASA, D. Calzetti (UMass) and the LEGUS Team.

A photograph of Irregular galaxy NGC 1427A.
NGC 1427APublic Domain | Image courtesy of NASA.

A photograph of Irregular galaxy DDO 80, also a dwarf galaxy.
DDO 80, Dwarf GalaxyCC BY 3.0 | Image courtesy of ESA/Hubble.