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Small galaxies with just a billion or so stars. Often found orbiting larger galaxies. Examples: Sagittarius Dwarf, Canis Major Dwarf.

Features a flat, rotating disk with spiral arms, a central bulge, and a surrounding halo. Examples: Milky Way, Andromeda.

Does not fit into other categories, lacks a defined shape, and often rich in gas and dust, with intense star formation. Examples: Large Magellanic Cloud, Small Magellanic Cloud.

Undergoing immense star formation activity, often resulting from merger or interaction. Examples: M82, NGC 4038/NGC 4039 (The Antennae Galaxies).

A quasi-stellar object, which is the highly active nucleus of a distant galaxy, emitting enormous amounts of energy. Examples: 3C 273, PHL 1811.

A type of active galaxy with a relativistic jet pointed in the direction of Earth. Examples: Markarian 421, BL Lacertae.

An intermediate type galaxy with a disk like a spiral galaxy but with very little interstellar matter, preventing the formation of new stars. Examples: NGC 5866, Spindle Galaxy.

A galaxy that is unusual in its size, shape, or composition, often due to gravitational interactions. Examples: Arp 220, ESO 510-G13.

Galaxies with a brightness so low they are difficult to detect against the background sky. Examples: Malin 1, UGC 477.

A variant of spiral galaxies with a central bar-shaped structure composed of stars. Examples: NGC 1300, Milky Way (suspected).

Generally older, rounder, and contain less dust and gas. They have little to no new star formation. Examples: M87, M49.

Has a ring-like appearance, thought to form from the collision of a smaller galaxy with a larger galaxy. Examples: The Cartwheel Galaxy, AM 0644-741.

A type of active galaxy whose core is extremely luminous, thought to contain supermassive black holes. Examples: NGC 4151, Messier 77.

A galaxy type which has low stellar density but is as large as the Milky Way. Examples: Dragonfly 44, NGC 1052-DF2.