Solar system

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Across
  1. 3. How many moons does earth have?
  2. 4. What planet is closest to the sun?
  3. 6. How many planets are there?
  4. 7. What planet is the hottest?
  5. 8. What element is the sun mostly made of?
  6. 10. What planet is the biggest?
  7. 13. What comet takes 75 years to be seen?
  8. 14. What planet is known for its rings?
  9. 16. How many moons does mars have?
  10. 17. What planet is red?
Down
  1. 1. What planets are the last 4 coming from space?
  2. 2. What planets are the first 4 from the sun?
  3. 5. Where do we live?
  4. 9. What planet is the coldest?
  5. 11. What element leaves a gold trail behind a meteor?
  6. 12. What dwarf planet used to be a planet?
  7. 15. What planet takes 17 hours to rotate?