Illustration of Black Hole with Accretion Disk and Torus. An artist's conception shows a black hole surrounded by a disk of hot gas, and a large doughnut or torus of cooler gas and dust. The light blue ring on the back of the torus is due to the fluorescence of iron atoms excited by X-rays from the hot gas disk.
(Illustration: CXC/M.Weiss) Source: http://chandra.harvard.edu/resources/illustrations/blackholes.html.

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