inner planets

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Across
  1. 3. A star
  2. 4. closest to the sun
  3. 7. rock in space
  4. 9. the thing all planets are in
Down
  1. 1. 2nd closest to sun
  2. 2. things that orbit our planets
  3. 3. orbit
  4. 5. 4th closest to sun
  5. 6. belt belt with loads of asteroids
  6. 8. 3rd closest to sun