Across
- 3. Earths twin
- 5. lightest
- 7. the centre of the solar system
- 8. sideways planet
- 11. home
- 12. Dwarf planet
- 13. our galaxy
Down
- 1. order of the planets
- 2. biggest
- 4. smallest
- 6. divider of the terrestrial and gas planets
- 9. rocky, metal thing in the asteroid belt
- 10. ball of gas