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Walker (19), Bradley C. Whitmore (1), Bruce Balick (7), Catherine Kaleida (3), Daniela Calzetti (4), Donald N. B. Hall (12), Erick T. Young (20) ((1) Space Telescope Science Institute, ETH-Zurich, Francesco Paresce (16), Howard E. Bond (1), Hwihyun Kim (3), INAF, Jay A. Frogel (11), John T. Trauger (18), Jon A. Holtzman (13), Joseph I. Silk (17), Marcella Carollo (8), Max Mutchler (1), Michael A. Dopita (10), Michael J. Disney (9), Patrick J. McCarthy (15), Randy A. Kimble (14), Robert O'Connell (6), Rogier A. Windhorst (3), Rupali Chandar (2)","submitted_at":"2011-03-21T14:18:36Z","abstract_excerpt":"We use new WFC3 observations of the nearby grand design spiral galaxy M83 to develop two independent methods for estimating the ages of young star clusters. The first method uses the physical extent and morphology of Halpha emission to estimate the ages of clusters younger than tau ~10 Myr. 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