#star  (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
  supertype:  #celestial_body__celestialbody__heavenly_body  natural objects visible in the sky
  instance:  #Alpha_Crucis  #Beta_Centauri  #Beta_Crucis  #Pollux  #Regulus  #Spica  #Sterope
  member of:  #extragalactic_nebula  #constellation
  subtype:  #binary_star__binary__double_star  a system of two stars that revolve around each other under their mutual gravitation
     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
     instance:  #Aldebaran  #Algol  #Alpha_Centauri__Rigil_Kent__Rigil  #Antares  #Epsilon_Aurigae  #Procyon  #Rigel__Beta_Orionis  #Vega
  subtype:  #Deneb  the brightest star in Cygnus
  subtype:  #Denebola  a star in Leo approximately 43 light years from Earth
  subtype:  #fixed_star__fixedstar  any star in the Ptolemaic theory of planetary motion
  subtype:  #giant_star__giantstar__giant  a very bright star of large diameter and low density (relative to the Sun)
     instance:  #Arcturus  #Capella
  subtype:  #loadstar__lodestar  guiding star; a star that is used as a reference point in navigation of astronomy
     instance:  #Polaris__North_Star__polar_star__polarstar__polestar
  subtype:  #multiple_star  a system of three or more stars associated by gravity
     instance:  #Castor__Alpha_Geminorum  #the_Trapezium__Trapezium
  subtype:  #neutron_star__neutronstar  a star that has collapsed under its own gravity; it is composed of neutrons
     subtype:  #pulsar  a degenerate neutron star; small and extremely dense; rotates very fast and emits regular pulses of polarized radiation
  subtype:  #nova  a star that ejects some of its material in the form of a cloud and become more luminous in the process
  subtype:  #red_dwarf_star__reddwarfstar__red_dwarf__reddwarf  a small cool star; approximately 100 times the mass of Jupiter
     subtype:  #flare_star__flarestar  a red dwarf star in which luminosity can change several magnitudes in a few minutes
        instance:  #Proxima_Centauri__Proxima
  subtype:  #red_giant_star__redgiantstar__red_giant__redgiant  a large cool star; has a relatively low surface temperature and a diameter large relative to the sun
  subtype:  #sun  a typical star that is the source of light and heat for the planets in the solar system; "the sun contains 99.85% of the mass in the solar system"
  subtype:  #sun.star  any star around which a planetary system evolves
  subtype:  #supergiant  an extremely bright star of very large diameter and low density
     subtype:  #Canopus  supergiant star 650 light years from Earth; second brightest star in the sky
     instance:  #Betelgeuse__Alpha_Orionis
  subtype:  #supernova  a star that explodes and becomes extremely luminous in the process
     instance:  #Crab_Nebula
  subtype:  #variable_star__variable  a star that varies noticeably in brightness
     instance:  #Polaris__North_Star__polar_star__polarstar__polestar
  subtype:  #white_dwarf_star__whitedwarfstar__white_dwarf__whitedwarf  a faint star of enormous density

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