Legacy Astronomical Images > Galaxies Series > Early-type Galaxies Unit
Early-type galaxies include elliptical and S0 ("lenticular") galaxies. They are round or elliptical in outline. Elliptical galaxies typically contain little gas and dust, no spiral arms or disk, and few hot, bright stars. Lenticular galaxies are also round or elliptical in outline, but have a disk component as well. Early-type galaxies are sometimes the hosts of quasars and powerful radio sources. Images of those objects are categorized separately under Active Galactic Nuclei.