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.
Topics: X-rays, Black hole, Astronomy, Human Interest, Ultraluminous X-ray source, Relativity, NGC, Dark matter, Galaxy, X-ray astronomy, X-ray