Figure 26-17: R I V U X G
A Globular Cluster A Globular Cluster A typical globular cluster contains 105 to 106 stars, each with an average mass of about 1 M⊙, so the total mass of a typical cluster is 105−106 M⊙. Cluster diameters range from about 6 to 120 pc (20 to 400 ly). Because these masses and diameters are comparable to the Jeans length (LJ) during the era of recombination, astronomers suspect that globular clusters were among the first objects to form in the universe.
A Globular Cluster A Globular Cluster A typical globular cluster contains 105 to 106 stars, each with an average mass of about 1 M⊙, so the total mass of a typical cluster is 105−106 M⊙. Cluster diameters range from about 6 to 120 pc (20 to 400 ly). Because these masses and diameters are comparable to the Jeans length (LJ) during the era of recombination, astronomers suspect that globular clusters were among the first objects to form in the universe.
(Hubble Heritage Team/AURA/STScI/NASA)