The Solar System Crossword

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Across
  1. 4. Which planet rotates on its side?
  2. 5. What keeps us on Earth?
  3. 6. Which planet is the hottest?
  4. 8. Which planet is the biggest?
  5. 13. Which group of planets are made of rocky material?
  6. 14. Which planet is the world of water?
Down
  1. 1. Which planet is the smallest?
  2. 2. Which group of planets have multiple moons and are very big?
  3. 3. Who discovered gravity?
  4. 7. Which planet is the coldest?
  5. 9. What fruit was involved in the discovery of gravity?
  6. 10. Name the planet on which some people think there was life at one point.
  7. 11. Which planet has lots of rings?
  8. 12. How many planets are in our Solar System?