Across
- 4. furthest planet from the sun
- 8. our sun and the objects that orbit around it
- 10. the star closest to earth
- 12. to turn on an axis
- 13. Saturn, Jupiter, Uranus and Neptune have it
- 14. planet that rotates on its side
- 17. planet closest to the sun
- 18. third planet from the sun
Down
- 1. dwarf planet with two moons
- 2. instrument used for seeing stars and planets
- 3. warmest planet; cloudy planet
- 5. a space traveler
- 6. It takes Earth 365 days to __ the sun
- 7. planet with the brightest rings
- 9. the red planet; humans have sent robots here
- 11. force that causes things to fall toward earth
- 15. number of stars in our solar system
- 16. large planet known for the Great Red Spot
- 17. Neil Armstrong was the first to walk on it