Across
- 2. rotates on a different tilt
- 4. biggest planet
- 6. center of the solar system
- 7. a planet's journey around the sun
- 8. Earth's slightly smaller twin
- 11. caused by the moon
- 12. causes day and night
- 14. half the diameter of Earth
- 15. used to be a planet
Down
- 1. a dwarf planet
- 3. second biggest planet
- 5. shape of Earth's orbit
- 9. coldest planet
- 10. smallest planet
- 13. causes seasons