Solar System

4. The ________ cloud is outside the Trans-Neptunian region that contains trillion of objects
5. Smallest planet in the solar system
6. Largest planet in the solar system
8. The ____________ belt is located outside of Neptune
9. Coldest planet in the solar system
11. ___________ is the reason that planets are round
13. The ________ contains over 99% of all of the mass in the solar system
15. Planet known for its distinct ring system
17. The _________ mission is where U.S. astronauts stepped foot on the moon
18. The solar system is approximately 4.6 ___________ years old

1. Pluto is considered a _________ __________
2. Iron oxide dust gives this planet its red hue
3. The space race was between United States and the ________ _______
5. ___________ is the reason scientist were able to predict where Neptune was located
7. Planet that is rotating at almost a 90 degree angle
10. 2/3 of this planet is covered in water
12. Hottest planet in the solar system
14. The ____________ belt is located between Mars and Jupiter
16. There is a possibility that Planet Nine is a primordial _________ __________