Solar System

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Across
  1. 4. The ________ cloud is outside the Trans-Neptunian region that contains trillion of objects
  2. 5. Smallest planet in the solar system
  3. 6. Largest planet in the solar system
  4. 8. The ____________ belt is located outside of Neptune
  5. 9. Coldest planet in the solar system
  6. 11. ___________ is the reason that planets are round
  7. 13. The ________ contains over 99% of all of the mass in the solar system
  8. 15. Planet known for its distinct ring system
  9. 17. The _________ mission is where U.S. astronauts stepped foot on the moon
  10. 18. The solar system is approximately 4.6 ___________ years old
Down
  1. 1. Pluto is considered a _________ __________
  2. 2. Iron oxide dust gives this planet its red hue
  3. 3. The space race was between United States and the ________ _______
  4. 5. ___________ is the reason scientist were able to predict where Neptune was located
  5. 7. Planet that is rotating at almost a 90 degree angle
  6. 10. 2/3 of this planet is covered in water
  7. 12. Hottest planet in the solar system
  8. 14. The ____________ belt is located between Mars and Jupiter
  9. 16. There is a possibility that Planet Nine is a primordial _________ __________