Difficult Space

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Across
  1. 1. The smallest constellation in our solar system
  2. 5. The Largest Volcano in Space
  3. 7. Color of the hottest stars
  4. 9. The largest constellation in our solar system
  5. 10. Coldest moon in our Solar System
  6. 11. The brightest star in the sky
  7. 13. This planet rotates on its side
  8. 15. Largest moon in the solar system
  9. 17. Place of Diamond Rain
  10. 18. The sun is mostly composed of this element
Down
  1. 2. The constellation the North Star resides in
  2. 3. This planet's day is 117 Earth days long
  3. 4. The North Star
  4. 6. Jupiter's closest Moon
  5. 8. Pluto's largest moon
  6. 12. Planet with the fastest rotation
  7. 14. Planet with the fastest orbit
  8. 16. Planet with the most moons