Definitions from Wiktionary (Cygnus X-1)

▸ noun:  A placename.
▸ noun:  (astronomy, physics) The first generally accepted and confirmed black hole. A black hole in a high-mass X-ray binary (HMXB) with a blue supergiant companion (HD 226868), located in the constellation Cygnus.
▸ noun:  (astronomy, physics) The high-mass X-ray binary star system containing this black hole and blue supergiant star.


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