Across
- 5. Cosmic snowballs that form tails when nearing the sun
- 6. A small rock body which orbits the sun
- 7. The only planet to rotate on it's side
- 8. The planet named after the Roman god of war
- 9. The biggest gas giant planet in the Solar System
- 11. The closest planet to the sun
- 13. The only planet to be downgraded to a dwarf planet
Down
- 1. Earth's only natural satellite
- 2. The only planet to rotate in the opposite direction
- 3. The planet with the most notable rings
- 4. The eighth planet from the sun
- 10. The only planet known to contain life in the Universe
- 11. What a meteoroid is known as when it enters Earth's atmosphere
- 12. A middle aged dwarf star at the centre of the Solar System