In all we know about 200 globular clusters. Strangely, the globular clusters do not rotate with the rest of the Galaxy. They pursue different orbits around the galactic centre. It is thought that they still follow the paths that they started when the galaxy was born. There are many different kinds of stars, and they evolve and decay over millions of years.
Many stars are binary stars, or double stars.
A binary star consists of two separate stars which revolve around each other. There are also triple and multiple stars. The largest stars are known as super-giants. Among them is Alpha Antares, which has a diameter about 330 times as great as that of the sun. However, these super-giants are not as dense as the Sun, because they consist mostly of gases.