Across
- 4. home of Pluto
- 7. Raised, light clouds
- 9. inner planets, Solid, Rocky surface
- 11. Matter in space that can turn into a meteor
- 13. Matter left over from a meteor
- 16. orbital shape is determined by
- 17. oval-shaped orbit
Down
- 1. hydrogen in the middle of liquid and gas
- 2. outer planets, mainly composed of hydrogen and helium
- 3. spherical-shaped object in space that's not a planet and not a satellite
- 5. appearing backwards motion of a planet
- 6. distance from the sun
- 8. Matter in space that creates a streak of light as it passes through Earths atmosphere
- 10. Material in space left over from planets' creations
- 11. Many many meteors are visible at one time
- 12. Icy snowball that created a streak of light as it releases gasses and flies through space
- 14. planet-wide system of cliffs on Mercury
- 15. sunken, dark clouds