That's called a supercluster.
A collection of galactic groups form a cluster of galaxies. A supercluster is the largest known structure. Galaxies can exist outside of a group or cluster, but the estimated amount is only about 5%. However, there is a possibility that these galaxies may have interacted or merged with other galaxies in the past,
Clusters of galaxies form due to the gravitational attraction between individual galaxies in a region of space. Over time, these galaxies are pulled together by their mutual gravity to create a cluster structure. The largest clusters are held together by dark matter, which provides the majority of the mass in the system.
GRAVITY!
Galaxies are vast collections of stars. So I guess you could say that a big group of stars forms a galaxy. Our galaxy has many big clusters of stars within it, so not all star clusters are galaxies. If you have a cluster of several million or billion (or trillion) stars surrounded by a lot of empty space, that is probably a galaxy.
Gravity is crucial for the formation and structure of galaxies in our universe. It pulls together gas, dust, and stars, allowing them to clump together and form galaxies. Without gravity, galaxies would not be able to hold together and maintain their shape. Additionally, gravity plays a key role in the interactions between galaxies, influencing their movement and behavior within the universe.
The possessive form for the plural noun galaxies is galaxies'.Example: Their galaxies' paths do not coordinate.
Galaxies clump together in clusters and superclusters due to the force of gravity. Gravity pulls galaxies towards each other, causing them to form groups and larger structures. This clustering is a natural result of the way matter is distributed in the universe.
Technically, the phrase "clustered together" is redundant. To cluster means to form a group of similar things closely together.
Dust clouds or just Dust
They form galaxies, galactic clusters, and galactic superclusters.
Particles in the universe, such as hydrogen and helium, play a crucial role in the formation and evolution of galaxies. These particles come together through gravity to form stars, which then group together to create galaxies. The interactions and movements of these particles shape the structure and behavior of galaxies over time.
The noun 'cluster' is a standardized collective noun for:a cluster of antelopesa cluster of beesa cluster of bombsa cluster of computersa cluster of diamondsa cluster of grapesa cluster of grasshoppersa cluster of knotsa cluster of porcupine fisha cluster of spidersa cluster of starsa cluster of things