Across
- 3. smooth, dark gray lowland regions
- 4. Retrograde rotation, and spins on its axis the slowest
- 7. Most eccentric orbit
- 8. lighter gray regions, mostly mountains and craters
- 10. Furthest planet from the Sun
- 11. Dwarf planet since 2006
- 12. "Planet of the rings"
Down
- 1. Wind shears give rise to enormous vortices, or storms, seen as white, brown or red ovals in its clouds
- 2. Originally named "George’s Star" after King George III
- 5. First planet, alphabetically
- 6. The 'red planet'
- 7. Earth's natural satellite
- 9. Gas surrounding a planet