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Why Black Holes "Light-Up"

31 May 2010, 15:19 UTC
Why Black Holes "Light-Up"
(200 words excerpt, click title or image to see full post)

NASA's Swift satellite detected an active black hole (indicated by the
white circle) in NGC 7319, one of the galaxies in the grouping known as
Stephan's Quintet.Supermassive black holes appear to light up with hard X-rays when their
parent galaxies decide to merge, according to a survey by NASA's
peeping Swift Satellite. Known as active galactic nuclei, Just 1 percent of super massive black holes currently put on such exhibitionist behavior by giving off as much as 10 billion times the sun's energy. Click on the post heading for more

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