Direct N-body integrations and Fokker-Planck simulations of the evolution of globular clusters that incorporate tidal interactions and lead to predictions of relativistic binary populations are also discussed. What Is a Globular Cluster Globular clusters are stable, tightly bound clusters of tens of thousands to millions of stars. The interaction of the components of hard binary systems alters the evolution of both bodies and can lead to exotic objects. Globular cluster evolution will focus on the properties that boost the production of hard binary systems and on the tidal interactions of the galaxy with the cluster, which tend to alter the structure of the globular cluster with time. In this review, we discuss the theoretical models of globular cluster evolution and binary evolution, techniques for simulating this evolution which lead to relativistic binaries, and current and possible future observational evidence for this population. These dynamical interactions can alter the evolution of individual stars and can produce tight binary systems containing one or two compact objects.

Most globular clusters are found in the large spherical halo of a galaxy. A typical galaxy may contain up to a few hundred globular clusters our galaxy, the Milky Way, has somewhere between 125 and 200 globular clusters orbiting the galactic center. Direct observational evidence for the creation of nuclear star clusters (NSCs) is needed to support the proposed scenarios for their formation. As a dense population of stars, globular clusters are the scene of many interesting close dynamical interactions between stars. Globular clusters are nearly spherical groups of about 10,000 to 1 million stars. These are far more common about two-thirds of the globular clusters in the Milky Way are from this. Most globular clusters are in the extreme Population II or halo class, having stars metal-poor relative to the Sun by factors of at least 6 or 7 (and in most. As an old population of stars, globular clusters contain many collapsed and degenerate objects. Globular clusters are stable, tightly gravitationally bound clusters of tens of thousands to millions of stars found in a wide variety of galaxies. The other, older globular clusters are more in the 10 billion to 12 billion-year-old range. The galactic population of globular clusters are old, dense star systems, with a typical cluster containing 10 4-10 7 stars.