Mystic Mountain Star Disc for the Homestar Flux. “Mystic Mountain” is a term for a region in the Carina Nebula, also known as the Grand Nebula, Great Nebula in Carina, or Eta Carinae Nebula. It is a large, complex area of bright and dark nebulosity in the constellation Carina, located in the Carina–Sagittarius Arm. The nebula lies at an estimated distance between 6,500 and 10,000 light-years. Stunning colors! This disc will NOT fit other brands of home planetariums.