#terrestrial_planet__terrestrialplanet  a planet having a compact rocky surface like the Earth's; the four innermost planets in the solar system
  supertype:  planet  any of the celestial bodies (other than comets or satellites) that revolve around the sun in the solar system
  instance:  Earth.terrestrial_planet  Red_Planet
  subtype:  inferior_planet  any of the planets whose orbit lies inside the earth's orbit
     instance:  Mercury  Venus

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