Introduction to Astrophysics/Galaxies:Shapes and Evolution

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The two main types of galaxies are elliptical (E) and spiral (S).

Galaxies are typically found in clusters. These clusters are categorized as regular or irregular. Regular clusters contain mainly E galaxies, and are large, dense, and spherical. These clusters have formed from many collisions, causing the S galaxies to become E galaxies. Irregular clusters are thin and have no symmetry. They contain mostly S galaxies.