Across
- 2. celestial objects that don't belong with planets
- 5. planets composed mostly of rock and metal
- 6. the hottest planet
- 8. small rocky objects from space
- 11. a young star
- 12. a cloud of dust and gasses
- 14. icy, rocky, objects with two tails
- 16. a planet that has rings
Down
- 1. area of space beyond the orbit of jupiter
- 3. celestial body that lays on the asteroid belt
- 4. the biggest planet
- 7. matter developing into a planet
- 9. a dwarf planet
- 10. mostly gaseous planets
- 13. a cloud of icy planetesimals
- 15. the only planet that can sustain human life