Provided by NASA Headquarters, Washington, D.C. Globular clusters (GCs) are thought to be ancient relics from the early formative phase of galaxies, although their physical origin remains uncertain 1, 2. Studying globular star clusters is critical to understanding the early, intense star-forming episodes that mark galaxy formation.

This suggests a common, single pathway for the formation of … As with open clusters, stars in globular clusters probably had a common origin. A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. A distant globular cluster that's home to dozens of fast-rotating stars could provide new clues about the formation of the Milky Way and the gas halo that surrounds the galaxy.. biased globular cluster formation. Smaller groups of stars are seen interacting and merging together to form the final cluster over millions of years of cosmic time. The specific frequencies of globular cluster systems, S_N~N_tot/L_V,gal~M_gcs/M_stars, are discussed in terms of their connection to the efficiency of globular cluster formation in galaxy halos, which is claimed to reflect a generic aspect of the star formation process as it operates even at the current epoch. The formation of globular clusters (GCs) remains one of the main unsolved problems in star and galaxy formation.

There are about 150 known globular clusters in the Milky Way. Recently, such multiple populations have been detected in $\sim$2 Gyr old compact, massive star clusters. However, a number of studies have since shown that many of the Milky Way’s globular clusters are made up of at least two distinct populations of stars and had far more complex formation … Star formation would have stopped in these clusters maybe 13 billion years ago, so only old stars are expected to be found there. They are known to reside in all but the faintest of galaxies. The gas (left) and stars (right) shown in a simulation of globular cluster formation. GCs …

Globular clusters are known to host multiple populations of stars with variations in their chemical abundances.

It is thought that globular clusters formed very early in the vast halo surrounding the nascent galaxy before it flattened to form the spiral disc. 47 Tuc is about 4,600 parsecs distant. The discovery of young globular clusters in merging galaxies and other environments provides an opportunity to study directly the process of globular cluster formation. Imaging and spectroscopy with the and large ground-based telescopes have together established that most galaxies have bimodal color distributions that reflect two subpopulations of old GCs: metal-poor and metal-rich. It is shown here that this dependence of globular cluster populations on galaxy type and environment can be readily explained as a consequence of the well-known statistical enhancement of rare high-density peaks in the primordial matter distribution, i.e. Globular cluster (GC) systems have now been studied in galaxies ranging from dwarfs to giants and spanning the full Hubble sequence of morphological types.

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