Star Clusters Star Clusters Star clusters are groups of hundreds of stars. There are two types of clusters - open clusters and globular clusters.
Open clusters can contain between a few hundred to a few dozen stars.
Sometimes, there are more prominent stars, while others tend to be less obvious. A globular cluster is much different from an open cluster. First, they do not lie in our galaxy, but rather on the outskirts of the universe. Second, they are in a practically symmetrical shape, whereas open clusters tend to take on the shape of their nebula. Globular clusters are also unique because they contain thousands and sometimes millions of stars.