Across
- 2. The imaginary line on which Earth and the moon rotate
- 4. The Earth's natural satellite
- 5. A chunk of rock or metal floating through space
- 6. A big ball of fire
- 7. The study of objects and their supposed effect on Earth
- 9. A chunk of rock or metal going through Earth's atmosphere
- 11. The shape of Earth's orbit
- 12. The shortest day of the year
- 15. The longest day of the year
- 16. The idea that the solar system revolves around the earth
- 18. This person believed that the universe was sun centered
- 19. This happens on September 21
- 20. The idea that the solar system revolves around the sun
- 21. The motion of an object around another object
- 22. An object that revolves around a planet
- 24. The now called "Dwarf Planet"
Down
- 1. The study of the planets
- 3. This happens on March 21
- 5. A chunk of rock or metal that hit the ground
- 8. This person believed that the universe was Earth centered
- 10. The point of the planets' orbit closest to the sun
- 13. Grouping of stars used for navigation
- 14. The planet closest to the sun
- 17. Our planet
- 21. The movement of Earth on its axis
- 23. The point of the planets' orbit farthest from the sun