A Black Hole found in binary star system: More than five times greater in mass than our Sun.
ScienceDaily (2011-03-25) -- The Gran Telescopio Canarias (GTC) has obtained the first spectroscopy data from the X-ray transient binary XTE J1859+226, which confirm the existence of a black hole.
Only about 20 binary stellar systems are known to contain a black hole, out of an estimated population of around 5,000 in the Milky Way Galaxy.
http://www.sciencedaily.com/releases/2011/03/110325082725.htm%22%3Eread full article
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