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The study of globular cluster systems is very important. Because these systems are so old, their investigation is a form of archeo-astronomy whereby a slow and, at times, tedious gathering of fragmentary data laboriously uncovers the skeleton of early galactic structures. Our theories and our imagination can then try to put some flesh on these bones in attempts to visualize what these early inhabitants of the Universe might have looked like.
Réne Racine (Tue,) studied this question.