Across
- 1. Rotates in opposite direction from other planets
- 3. Icy body with long tail
- 6. Coldest planet
- 10. Coral reefs are this planet's largest living structure
- 11. Has about 50 moons
- 14. Smallest planet in our solar system
Down
- 2. Dwarf planet
- 4. Moves away from Earth at 1.5" per year
- 5. Rocky objects orbiting the sun
- 7. Has a prominent ring system
- 8. Star at center of our solar system
- 9. Our galaxy
- 12. Hottest planet which spins backward
- 13. Only planet inhabited entirely by robots