#satellite  any celestial body orbiting around a planet or star
  supertype:  #celestial_body__celestialbody__heavenly_body  natural objects visible in the sky
  instance:  #Titan.satellite
  subtype:  #Deimos  the smaller of the two satellites of Mars
  subtype:  #Galilean_satellite__Galilean  one of the four satellites of Jupiter that were discovered by Galileo
     instance:  #Callisto  #Europa  #Ganymede  #Io
  subtype:  #moon.satellite  any natural satellite of a planet; "Jupiter has sixteen moons"
  subtype:  #moon  the natural satellite of the Earth; "the average distance to the moon is 384,400 kilometers"; "men first stepped on the moon in 1969"
  subtype:  #Phobos  the larger of the two satellites of Mars

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