Composition:
Population II Stars
Lifespan
+15 billion yearsNumber of stars
10,000 to 1,000,000 starsNotes:
Globular clusters are gravitationally bound concentrations of stars. Spectroscopic study of globular clusters shows that they have much less heavy element than stars that form in the disks of galaxies, such as the Sun. Thus, globular clusters are very old and formed from an earlier generation of stars.Example (on left): NGC 5139.
