Outer Space Crossword puzzle

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Across
  1. 1. Giant Jupiter
  2. 7. moon Triton
  3. 9. millions in the solar system
  4. 11. On the edge of the solar system
  5. 13. to Sun Mercury
  6. 15. Coldest body in solar system
  7. 17. Day Venus
  8. 18. of our solar system Saturn
Down
  1. 2. Huge ring system
  2. 3. smaller than earths moon
  3. 4. known planets Dwarf planets
  4. 5. Giant dust storms
  5. 6. five percent water Earth
  6. 8. rotation Mercury
  7. 10. planets Havent cleared orbital path
  8. 12. Moon has no atmosphere
  9. 14. Known Rings Uranus
  10. 16. Fastest are 26 miles per second