Irregulars and dwarves
Images of irregular galaxies
Irregular galaxies are smaller than elllipticals and spirals. They have neither a bulge nor a disk, and tend to be blue.
Images of dwarf galaxies
Dwarf galaxies are as small as irregular galaxies. They look like a diffuse halo with either the round shape of an elliptical, or the flat shape of the disk of a lenticular. They are white in colour, with sometimes a very dense nucleus of stars in their center.