A supermassive black hole (SMBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses. Most—and possibly all—galaxies are inferred to contain a supermassive black hole at their centers. In the case of the Milky Way, the SMBH is believed to correspond with the location of Sagittarius A*. Supermass...
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http://en.wikipedia.org/wiki/Supermassive_black_hole
(from the article `Physical Sciences`) ...a patch of the sky about the size of the full moon that was conducted with the Chandra X-ray Observatory, Spitzer Space Telescope, and two ... ...understood in terms of multiple supernova explosions in a confined space near the centres of starburst galaxies. Nevertheless, for the most ... [2 ...
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http://www.britannica.com/eb/a-z/s/188
Artist's impression of s supermassive black hole ripping apart a star and consuming some of its matter. Illustration: NASA/CXC/M.Weiss A black hole with a mass of several hundred thousand to more than ten billion solar masses. The central region of virtually every galaxy is thought to contain a...
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