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A globular cluster ~15 My old that contains 5x10^5 Msun of stars inside an 11pc radius has been found in the nearby spiral galaxy NGC 6946, surrounded byclouds of dust and smaller young clusters inside a giant circular bubble 300 pcin radius. At the edge of the bubble is an arc of regularly-spaced clustersthat could have been triggered during the bubble's formation. The region is atthe end of a spiral arm, suggesting an origin by the asymmetric collapse ofspiral arm gas. The globular is one of the nearest examples of a cluster thatis similar to the massive old globulars in the Milky Way. We consider theenergetics of the bubble and possible formation mechanisms for the globularcluster, including the coalescence of smaller clusters.Comment: 20 pages, 7 figures, accepted for Astrophysical Journal Vol 535, June  1 200

A Young Globular Cluster in the Galaxy NGC 6946