Across
- 3. length of time it takes Earth to make 1 rotation around sun
- 4. has many rings
- 6. planet we live on
- 7. time it takes Earth to make one full rotation on its axis
- 9. dwarf planet
- 14. the main star in our solar system
- 15. unit of measure for how far a planet is from the sun
- 16. theory that explains how the universe began
- 18. caused by the moon's gravity
- 19. closest planet to the sun
- 20. season when Northern hemisphere is tilted toward the sun
Down
- 1. rotation around the sun
- 2. type of planet (Earth, Venus, Mars, Mercury)
- 5. cloud of dust, gasses, particles in space
- 8. believed to have been the cause of a mass extinction
- 10. first element
- 11. force pulling us toward center of Earth
- 12. largest planet
- 13. evidence used to determine age of Earth
- 17. Earth is tilted on this