Galaxies are divided into four main groups: spiral, barred spiral, elliptical, and irregular. this is just a theories, Nearly all large galaxies are thought to also contain supermassive black holes at their centers.
Dwarf Galaxy- A relatively small galaxy. The Large and Small Magellanic Clouds, visible in the Southern Hemisphere, are two dwarf irregular galaxies that are neighbors of the Milky Way."
Dwarf PLanet-A celestial body within the solar system that shares the characteristics of planets. It orbits the Sun, is not a moon, and has a spherical or nearly spherical shape. Unlike a planet, however, a dwarf planet has not cleared away any loose cosmic rubble from its orbit. Dwarf planets include Ceres, Pluto, and Eris
Exoplanet-A planet that orbits a star other than the sun
Galaxy Cluster-A collection of dozens to thousands of galaxies bound together by gravity
Galaxy Evolution-The study of the birth of galaxies and how they change and develop over time
Globular Cluster-A collection of hundreds of thousands of old stars held together by gravity. Globular clusters are usually spherically shaped and are often found in the halos of galaxies. Each star belonging to a cluster revolves around the cluster's common center of mass
Irregular Galaxy- A galaxy that appears disorganized and disordered, without a distinct spiral or elliptical shape. Irregular galaxies are usually rich in interstellar matter, such as dust and gas. The Large and Small Magellanic Clouds are examples of nearby irregular galaxies
a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms
An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the three main classes of galaxy described by Edwin Hubble in his Hubble sequence and 1936 work The Realm of the Nebulae, along with spiral and lenticular galaxies
