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Date: 2009-01-16 12:48:33Spaceflight Ursa Major constellation X-ray astronomy Supermassive black hole Harvard–Smithsonian Center for Astrophysics Stellar black hole Messier 82 American Astronomical Society 215th meeting Astronomy Space Chandra X-ray Observatory | Chandra :: Photo Album :: M81 :: M81 HandoutAdd to Reading ListSource URL: chandra.harvard.eduDownload Document from Source WebsiteFile Size: 271,39 KBShare Document on Facebook |