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3 Types of Galaxies. By- Taewoo Kang. Spiral. Bulge at the center and spiral arms. The spiral arms are made up of gas, dust, and new stars. Named for the spiral star structure that extends from the center into the disk.
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3 Types of Galaxies By- Taewoo Kang
Spiral • Bulge at the center and spiral arms. • The spiral arms are made up of gas, dust, and new stars. • Named for the spiral star structure that extends from the center into the disk. • Originally described by Edwin Hubble in his 1936 works The Realm of the nebulae and as such forms part of the Hubble sequence. • Roughly two-thirds of all spirals are observed to have and additional component in the form of a bar-like structure.
Irregular • Does not have a distinctive shape. • There are two types of Irregular galaxy called IrrI and IrrII. • They do not fall into any of the classes of the Hubble sequence. • IrrI has some structure but not enough to place it cleanly into the Hubble sequence. • IrrII does not appear any feature.
Elliptical • Having an approximately ellipsoidal shape. • Simply massive blob of stars. • It has very bright centers and very little dust and gas. • Also originally described by Edwin Hubble in his 1936 work. • Composed of older low mass stars, with a sparse interstellar medium and minimal star formation activity.
Sources • NASA • KidsRex
