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This paper reviews some recent work on the properties of the outer halos ofgalaxies. I particularly focus on recent and upcoming advances made with thestudy of globular clusters. Globular clusters can be observed out to ~100 kpcfrom the centers of galaxies, allowing the study of galactic halos well beyondthe regions probed by many other techniques such as observations of theintegrated light of galaxies. In the few well-studied cases to date, the studyof globular cluster systems has provided dynamical evidence for dark matterhalos around elliptical galaxies, and demonstrated kinematic differencesbetween different globular cluster populations that shed light on the formationhistory of their host galaxies.Comment: 10 pages, 4 figures, invited review to appear in the proceedings of  the Yale Cosmology Workshop on "The Shapes of Galaxies and Their Halos", ed.  P. Nataraja

PROPERTIES OF THE OUTER HALOS OF GALAXIES FROM THE STUDY OF GLOBULAR CLUSTERS