#binary_star__binary__double_star  a system of two stars that revolve around each other under their mutual gravitation
  supertype:  star  (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
  instance:  Aldebaran  Algol  Alpha_Centauri  Antares  Epsilon_Aurigae  Procyon  Rigel  Vega
  subtype:  Altair  double star 15.7 light years from Earth; the brightest star in the Aquila constellation
  subtype:  Sirius__Dog_Star__Canicula__Sothis  the brightest star in the sky; in Canis Major

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