Which black hole was the first to be discovered?
In the constellation Cygnus, there is a double star, one of whose components has such a high surface gravity that light cannot escape from it. It is Cygnus X-1, which many astronomers believe to be the first "black hole" to be detected.
In the constellation Cygnus, there is a double star, one of whose components has such a high surface gravity that light cannot escape from it. It is Cygnus X-1, which many astronomers believe to be the first "black hole" to be detected.
which one first?
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