Across
- 2. coldest planet in the Solar System
- 3. gas that absorbs red light causing Uranus to appear blue
- 10. largest terrestrial planet
- 11. largest planet in the solar system
- 12. planet that spins clockwise (backward)
- 13. tallest mountain in the Solar System
- 15. one-third the size of Earth
- 16. one of the moons of Mars
- 17. axis so tilted, planet appears to spin sideways
- 18. Planet with the hottest surface temperature
Down
- 1. largest moon in the Solar System
- 4. smallest outer planet
- 5. number of moons orbiting Saturn
- 6. dwarf planet made of mostly ice, 5 moons
- 7. Pluto's largest moon
- 8. largest of the dwarf planets
- 9. terrestrial planet with the most moons
- 14. smallest terrestrial planet
- 15. terrestrial planet half the size of Earth