Mergers between these astronomical objects when one is much more massive than the other is known as cannibalism. Most of these structures are found in larger groups and clusters such as the Local Group. They are often categorized by the Hubble sequence based on their visual appearance, and they can be classified as lenticular, elliptical, and spiral. Supermassive black holes are believed to exist in the center of many of these structures. For 10 
Mergers between these astronomical objects when one is much more massive than the other is known as cannibalism. Most of these structures are found in larger groups and clusters such as the Local Group. They are often categorized by the Hubble sequence based on their visual appearance, and they can be classified as lenticular, elliptical, and spiral. Supermassive black holes are believed to exist in the center of many of these structures. For 10 points, name this astronomical massive gravitationally bound system, examples of which include the Andromeda and the Milky Way.
Mergers between these astronomical objects when one is much more massive than the other is known as cannibalism.
{galaxy}