13.1: Irregular Galaxies

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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.