Across
- 3. used to be planet nine but now is a dwarf planet
- 5. smallest planet in the solar system
- 6. season that occurs when the north pole tilts away from the sun
- 8. the changing face of the moon each night
- 11. theory that the universe began with a huge explosion over 13 billion years ago
- 13. the only planet with life on it
- 16. force of attraction between objects
- 17. largest planet in the solar system
- 18. when the face of the moon is completely lit up
- 22. mainly found between Mars and Jupiter
- 23. the movement of a planet around the sun
- 24. when the face of the moon is completely dark
- 25. hottest planet in the solar system
Down
- 1. when the shadow of one object in space falls on another object
- 2. Earth in the center of the universe
- 4. the red planet
- 7. the spinning of a planet on its axis
- 9. planet with the most moons
- 10. space rocks that burn up in Earth's atmosphere
- 12. used a telescope to explore space
- 14. season that occurs when the north pole tilts toward the sun
- 15. planet with a storm known as the Great Dark Spot
- 19. planet made of smelly gases like methane and ammonia
- 20. sun in the center of the solar system
- 21. the cause of seasons on Earth