Across
- 2. A dwarf planet in the Asteroid Belt
- 6. Term for moon phase that's "growing"
- 8. The study of space and celestial objects in space
- 11. When a star violently explodes it results in this
- 12. No longer considered a planet
- 14. Rocky object orbiting the Sun
- 15. The least dense planet; known for its prominent rings
- 17. A dwarf planet alongside Pluto in the Kuiper Belt
- 18. Rocky planet with the longest day; atmosphere thick with toxic gas
Down
- 1. Ice giant planet that rotates sideways
- 3. A force of attraction between objects with mass
- 4. Term for moon phase that's "shrinking"
- 5. The third planet from the Sun
- 7. The Milky Way is one of these
- 9. Humans have sent many rovers to the surface of this planet
- 10. The largest planet
- 13. Planet with the shortest year
- 16. The planet with the longest year