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The outer regions of globular clusters can enable us to answer manyfundamental questions concerning issues ranging from the formation andevolution of clusters and their multiple stellar populations to the study ofstars near and beyond the hydrogen-burning limit and to the dynamics of theMilky Way. The outskirts of globular clusters are still uncharted territoriesobservationally. A very efficient way to explore them is through high-precisionproper motions of low-mass stars over a large field of view. The Wide FieldInfraRed Survey Telescope (WFIRST) combines all these characteristics in asingle telescope, making it the best observational tool to uncover the wealthof information contained in the clusters' outermost regions.

Astro2020 Science White Paper: Science at the edges: internal kinematics of globular clusters' external fields