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Last updated on April 24, 2014 at 21:22 EDT
Middleweight Black Hole
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Middleweight Black Hole

November 11, 2009
Swift X-ray observations of galaxy NGC 5408 indicate its ultraluminous X-ray source undergoes periodic changes every 115.5 days. This cycle, astronomers suspect, is linked to the orbit of a donor star around a middleweight black hole, as shown in this artist's view. Credit: NASA