Gordon's crossword

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Across
  1. 5. the best car
  2. 8. the fastest car ever
  3. 9. the fastest plane ever
  4. 11. the biggest lizard alive
  5. 12. the best wolf
  6. 13. the lightest car ever
Down
  1. 1. the biggest star
  2. 2. the planet the human race will live soon
  3. 3. the biggest snake ever
  4. 4. the first car
  5. 6. the smallest planet in our solar system
  6. 7. the biggest planet in our solar system
  7. 10. large flying bird