Across
- 6. A large space rock likely to be near Mars or Jupiter.
- 7. A shooting star.
- 10. The planet with the brightest ring system.
- 14. Used to measure the distances between planets.
- 15. Large planets with low density and no solid surface.
- 19. The orbital speed of planets does this as you move away from the sun.
- 21. A comet could come from here.
- 22. The only planet with liquid water.
Down
- 1. The planet with the longest year.
- 2. Is tipped over on its side and rotates perpendicular to the sun.
- 3. The planet with the most extreme temperatures because of its thin atmosphere.
- 4. The name of the galaxy our solar system is in.
- 5. The hottest planet because of the greenhouse effect.
- 8. When a planet orbits the sun.
- 9. When a planet spins on its axis.
- 11. What protects Earth from meteoroids.
- 12. Rocky, dense planets with solid surfaces.
- 13. The red planet.
- 16. The only star in our solar system.
- 17. The most massive planet.
- 18. The tail of a comet that always points away from the sun.
- 20. A dirty snow ball.