Across
- 2. tendency of an object to resist a change in motion
- 5. amount of matter in an object
- 6. a meteoroid that has passed through the atmosphere and hit Earth’s surface
- 9. push or pull
- 10. Earth's sister planet
- 13. rocky body that orbit the sun
- 15. named for the Roman god of the sea
- 17. only inhabitable planet
- 18. revolution around an object
- 20. largest planet
- 21. a small, rocky or metallic body that travels through space
Down
- 1. the red planet
- 3. natural division between inner and outer planets
- 4. a small body of ice, rock, and dust with a tail
- 5. a meteoroid that is burning up from friction in Earth’s atmosphere
- 7. attraction between two objects with mass
- 8. planet with visible rings
- 11. rotates on its side
- 12. force of gravity on an object
- 14. smallest planet
- 16. shape of planets orbit
- 19. famous mathematician who hypothesized about gravity