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This slide set focuses on the the discovery of extensions of galactic disks made up of hot, young stars bright in ultraviolet light, made by the GALEX mission with follow-up by the Hubble Space Telescope. It is one of a series of short, topical presentations on new developments from NASA astrophysics missions, relevant to introductory astronomy topics. These resources are intended to help instructors include the latest discoveries (not yet in their textbooks) into their courses. The slide sets are constructed to be easily included as a lecture supplement including synopsis, references, and graphics.