Cygnus X-1
http://blackholes.stardate.org/objects/factsheet.php?p=Cygnus-X-1
Several thousand light-years away, near the "heart" of Cygnus, the swan, two stars are locked in a gravitational embrace. One star is a blue supergiant, known as HDE 226868. It is about 20 times as massive as the Sun and 300,000 times brighter. The other star is 15 times the mass of the Sun, but it's extremely small. The object must be the collapsed core of a star. Its mass is too great to be a white dwarf or a neutron star, though, so it must be a black hole -- the corpse of a star that once resembled the supergiant.
The system is called Cygnus X-1, indicating it was the first source of X-rays discovered in the constellation Cygnus. Discovered by the Uhuru X-ray satellite in 1971, it was also one of the first suspected black holes.
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