A globular cluster is a group of old stars that are very close to each other and together are in the form of a sphere. A sphere is in the shape of a circle.
A large, spherical cluster of stars located in the halo of the galaxy.These clusters, containing up to several hundred thousand members, are thought to be among the oldest objects in the galaxy. A to F | G to L | M to R | S to Z
A globular star cluster is a spherical group of up to a million stars held together by gravity. These remote objects lie mostly around the central bulge of spiral galaxies. The brightest globular cluster is Omega Centauri (in the constellation Centaurus); it is easily seen by the naked eye and is magnitude 4.