7. Eye of Sauron

Giant Black Hole Looks Like 'Eye of Sauron,' Scientists Say - space.com, 11 March 2011

Observing the black hole that sits at the heart of a spiral galaxy called NGC 4151, which is 43 million light-years from Earth, scientists are trying to determine the cause of powerful X-ray emission which comes from that region. There're two possible scenarios. One possibility is that black hole was growing much more rapidly about 25,000 years ago and material was falling into the black hole which produced this powerful radiation. According to the second scenario, material spiraling into the black hole from an accretion disk spawned a vigorous outflow of gas from the surface of this disk, which then heated the gas in its path to X-ray-emitting temperatures.

Black hole research is one of the most challenging areas of astrophysics. No direct experiments are possible, and all results are based math used to build models to explain observation data, sometimes in more than one way. To me this always makes these explanations somewhat tentative, which is why i find methaphors like the one used in this article ("Eye of Sauron") very appropriate.