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Globular Star Clusters; Observational Cosmology

We are analyzing the globular cluster systems associated with external galaxies and elucidating their photometric and spatial properties. Globular clusters are the earliest-formed components of galaxies, and their nature and distribution will provide clues into the complex subject of galaxy formation and enrichment. Because the great intrinsic luminosity of globular clusters allows them to be readily seen in remote external galaxies, they are ideal cosmic distance indicators. We are developing refinements in this application as part of a comprehensive review of the extragalactic distance scale.