Across
- 2. space rock that orbits the sun
- 5. the theory that explains how our moon was formed
- 7. the force that governs all movement in the universe
- 8. the largest planet
- 10. top layer of the sun
- 11. the greater the ________ the weaker the gravitational force
- 14. space rock that hits the Earth's surface
- 15. how many stars are in our solar system
- 16. smallest planet closest to the sun
- 19. process of a star making energy where hydrogen is turned into helium
- 20. space rock that burns up completely in our atmosphere
Down
- 1. moon phase when the sun, Earth and moon make an L shape
- 3. movement of Earth on its axis
- 4. first day of winter (December 20-23)
- 6. the distance between the Earth and the sun
- 9. moon is between the sun and the Earth and the moon's shadow falls on the Earth
- 12. center of the sun
- 13. first day of spring (March 20-23)
- 17. movement of planets around the sun
- 18. Earth is between sun and moon and sun's light not reaching the moon