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Across
  1. 3. discovered by Sir William Herschel in 1781.
  2. 4. the 4th planete on the solar system
  3. 6. the most distant planet that can be seen with the naked eye
  4. 7. one days egal 117 earth days
  5. 8. ways It has over 200 billion stars
  6. 9. this rotation is gradually slowing
Down
  1. 1. the smallest gas giant.
  2. 2. the fourth brightest object in the solar system.
  3. 4. the smallest planete
  4. 5. travel at 18,000 miles per hour