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| 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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