Galaxies: Collisions, Types and How They're Made

Types Galaxies – NASA Universe Exploration

Types of Galaxies: Why Galaxies Come in Different Shapes

Andromeda's halo already bumping into Milky Way's ahead of collision

What are the four types of galaxies? - Quora

Types Galaxies – NASA Universe Exploration

Collisions made early galaxies grow huge

ViewSpace Interacting Galaxies: Future of the Milky Way

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Galaxy Mergers and Active Galactic Nuclei