Cygnus X-1 is a galactic X-ray source located in the northern constellation Cygnus. The X-ray source is believed to be a stellar mass black hole, one created from the collapse of a massive star about 5 to 6 million years ago. It is one of the strongest sources of X-ray emissions discovered and was the first X-ray source that was widely accepted to be a black hole candidate.
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Deneb, Alpha Cygni, is the brightest star in Cygnus constellation and the most distant of all first magnitude stars.