Cygnus X-1

English

Etymology

Cygnus +‎ X +‎ 1. From being the first discovered discrete astronomical X-ray source (an X-ray star) located in the constellation of Cygnus.

Proper noun

Cygnus X-1

1. A placename.
   1. (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.
   2. (astronomy, physics) The high-mass X-ray binary star system containing this black hole and blue supergiant star.

Synonyms

• Cyg X-1 (abbreviation)

Derived terms

• Cyg X-1 (abbreviation)