Astronomers have used NASA's Chandra X-ray Observatory to discover a ring of black holes or neutron stars in a galaxy 300 million light years from Earth. Source: [url=http://www.nasa.gov/centers/marshall/history/cosmic-collision-forges-galactic-one-ring-in-x-rays.html]Cosmic Collision Forges Galactic One Ring—in X-rays[/url]


David Cottle

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