Across
- 2. Smallest of the 8 planets
- 5. Largest of the 8
- 8. Red Planet, Two moons
- 9. Ringed Planet
- 12. Sideways Planet, has lower surface gravity than Earth
- 13. Moon orbits Jupiter, largest moon in the solar system
- 14. Only moon with a thick atmosphere
- 16. Dwarf planet as of 2006
- 17. Densest of the 8 planets
- 18. Hottest of the 8 planets
Down
- 1. Neptune's largest moon
- 3. Moon with a hidden ocean
- 4. Moon is about as large as Mercury
- 6. Most volcanically active body in the solar system
- 7. Moon in Spanish
- 8. Uranus' moon with many dips and cracks
- 10. Pluto's largest moon
- 11. Mars' smaller moon
- 15. Windy and farthest of the planets
- 16. Mars' larger moon