Middleweight Black Hole
Credit: NASA, Posted on: Wednesday, 11 November 2009, 06:48 CST Download full size image
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.
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