Across
- 4. hottest planet
- 6. time it takes to make an orbit
- 8. smallest planet
- 10. home to Olympus Mons & Valles Marineris
- 11. 8th planet; highest wind speeds
- 12. cloud of gas and dust that formed solar system
- 15. one of the 4 inner planets
- 16. one of the 4 outer planets
- 17. sun, planets, & all objects revolving around the sun.
- 19. a planet outside the solar system
Down
- 1. largest planet
- 2. small asteroid-like body that formed planets
- 3. region containing small bodies made of ice
- 5. 2nd largest planet
- 7. object that orbits the sun but is very small
- 9. degree of elongation of an orbit
- 13. 7th planet; titled 90 degrees
- 14. large body in space that orbits a star
- 18. tendency to resist a change in motion