Uranus and neptune

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Across
  1. 6. The probe that visited both Uranus and Neptune
  2. 7. The kind of planet that Uranus and Neptune are
  3. 8. How many years it takes Uranus to orbit the sun
  4. 10. One of Neptune's moons which orbits the planet in retrograde motion
  5. 11. The main element in both planets
  6. 12. The 8th, coldest, and furthest away planet
  7. 13. The man who discovered Uranus
Down
  1. 1. Uranus's moons are named after this author's characters
  2. 2. Which king was Uranus originally going to be named after
  3. 3. How rotation speed of gas giants is measured
  4. 4. The man that used mathematics to plot neptune's orbit
  5. 5. How Uranus was discovered
  6. 9. The planet known for orbiting on its side