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Earth is a planet in our solar system where we call home. Where is our solar system, though? It is only a tiny portion of the Milky Way Galaxy.
A galaxy is a vast collection of stars, solar systems, gas, and dust. Gravity holds a galaxy together. There is also in the center of our galaxy, the Milky Way.
Galaxies have different shapes from one another, with variances stemming from how the systems were created and later developed. Galaxies are incredibly diverse, both in terms of their internal structure and the amount of activity that can be seen. Some of these are the locations of active star formation, complete with the accompanying luminous gas, dust clouds, and molecular complexes. Others, in comparison, are dormant and no longer produce new stars. The greatest noticeable activity in galaxies may be seen in their nucleus, where evidence shows that supermassive objects—likely black holes—lurk often. These center black holes are now being seen emerging in galaxies at great distances, where they are thought to have originated several billion years ago.
Before the early 20th century, galaxies were not even thought to exist. But since then, galaxies have been one of the main areas of astronomy study. This article surveys the significant advancements and successes in the study of galaxies. Discussion topics include the evolution of galaxies and quasars, as well as the external galaxies (i.e., those outside the Milky Way Galaxy, the neighborhood galaxy to which the Sun and Earth belong). Visit Milky Way Galaxy to learn more about the Milky Way Galaxy. See star and nebula for further details on the elements that make up galaxies.