Space Crossword

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Across
  1. 3. billions of comets beyond Pluto
  2. 4. "dirty snowballs"
  3. 7. Line planets rotate on
  4. 9. between Mars and Jupiter
  5. 12. A meteor that strikes Earth
  6. 13. largest planets
Down
  1. 1. distance between Earth and Sun
  2. 2. first four planets
  3. 5. meteoroid burning as it enters Earth's atmosphere
  4. 6. huge chunk of irregularly shaped rocks
  5. 8. space dust or rock
  6. 10. planets with no solid surface
  7. 11. Planets small Earth like planets