Solar System Crossword

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Across
  1. 4. Venus is the ________________ planet in the Solar System
  2. 6. This planet could float on water
  3. 7. This planet rotates vertically on its axis
  4. 11. Neptune is the _____________ planet in the Solar System
  5. 13. This planet is proposed to once have had liquid oceans covering the planet
  6. 18. Uranus is the _______________ planet in the Solar System
  7. 19. The _______________ separates the inner planets from the outer planets
  8. 20. The largest moon in the Solar System
Down
  1. 1. This planet has not "cleared its neighborhood"
  2. 2. The outer planets are also known as the ______________.
  3. 3. This planet has a day longer than its year
  4. 5. Saturn has 82 of these
  5. 8. This is the furthest planet from the Sun
  6. 9. This planet has a diameter of about 275,000 miles
  7. 10. This planet is the only planet known to have liquid water
  8. 12. This moon of Jupiter is thought to potentially house life
  9. 14. Mercury is the ________________ planet in the Solar System
  10. 15. The outer planets are all _____________ than the inner planets
  11. 16. Every inner planet has three layers, the ________, mantle, and core
  12. 17. The planet closest to the sun