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Date: 2015-01-15 14:23:22Space Galaxies Local Group Spiral galaxies Black holes Andromeda Galaxy Milky Way Abell 400 Sagittarius A* Astronomy Extragalactic astronomy Supermassive black holes | Composite image shows two black holes orbiting each otherAdd to Reading ListSource URL: phys.orgDownload Document from Source WebsiteFile Size: 28,91 KBShare Document on Facebook |