Inner Planets

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Across
  1. 2. a thing that divides the two sets of planets
  2. 3. second planet from the Sun
  3. 5. the first four planets, rocky terrain
  4. 7. moving repeatedly around
  5. 8. last of the inner planets
  6. 9. the gases that surround a planet
Down
  1. 1. meaning Earth-like
  2. 4. first inner planet
  3. 6. third planet away from the Sun
  4. 8. a celestial object that orbits something