a galaxy with no definite structure. Stars are distributed in bunches placed randomly throughout the galaxy. Many irregular galaxies have a lot of gas and dust still left in them from which stars are now forming.
galaxy with a very irregular shape and no obvious elliptical or spiral structure. They are classified as type Irr. Irregular galaxies with a crude spiral-like structure are often classified as type Sm (or type SBm if they also have a central bar).
An irregular galaxy is a galaxy with no rotational symmetry (it is neither spital, elliptical nor lenticular). Irregular galaxies usually contain only 100 million to 10 billion stars. Some are cloud-lie (with no apparent structure) and others are more standard shapes that have been distturbed. For example, the Magellanic Cloud is an irregular galaxy.
An irregular galaxy is a galaxy that does not fall into the Hubble classification for galaxies. 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.