Elliptical galaxies do not have disks, spiral arms or dust lanes. Their brightest stars are red and they are classified by the degree of flatness. E0 are circular and E7 are the flattest. Star formation ended in these galaxies billions of years ago. They are supported by random motions of stars with some very slow rotation.
Irregular Galaxies
Show an irregular, often chaotic structure. They has lots of young blue stars. There is moderate rotation in Irregulars, but very chaotic motions as well. There is often a great deal of on-going star formation.
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