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Has Cygnus-x been proven to be a black hole?

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Cygnus X-1 is a so-called stellar-mass black hole, a class of black holes that comes from the collapse of a massive star. The black hole pulls material from a massive, blue companion star toward it. read more

Cygnus x-1 was the first compact object believed to be a 'real' black hole. But, the only supporting 'facts' that are given to "prove" Cygnus x-1 is a black hole are based on HDE226868 (HDE), a Supergiant blue star that resembles a "micro-spiral-galaxy". read more

Cygnus X-1 (abbreviated Cyg X-1) is a galactic X-ray source in the constellation Cygnus, and the first such source widely accepted to be a black hole. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 2.3 × 10 −23 W m −2 Hz −1 (2.3 × 10 3 Jansky). read more

Cygnus X-1, since then, has been an object of intensive studies for astrophysicists all around the globe. Most experts believed that it was a black hole and all evidence pointed to that. Stephen Hawking thought otherwise. read more

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