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