Illustrated · 1 min
Galaxies are the vastly different groupings of stars. Each galaxy may contain billions or possibly trillions of stars. Galaxies are found in clusters, and even these clusters have clusters. No one, not any astronomer, could have the complete understanding of how galaxies are formed. The mainly accepted theory is the big bang theory. All anyone knows, at least right now, is that galaxies formed in the early ages of the universe.
