Across
- 2. when a meteoroid completely burns up in our mesophere
- 7. the idea that objects in motion stay in motion
- 10. largest thing in our solar system
- 11. model of the solar system with the sun in the center
- 12. a smaller version of an asteroid
- 16. without this, our planet would fly off into space
- 17. small bodies with ice and dust
- 18. type of galaxy that we live in
- 20. smallest planet with no atmosphere
- 21. largest planet
Down
- 1. planet with the longest orbit
- 3. Earth's twin with an extreme greenhouse effect
- 4. planet that used to have liquid water
- 5. planets that are small, rocky and close to the Sun
- 6. known for its rings with a very low density
- 8. most asteroids are found here between mars and jupiter
- 9. name of our galaxy
- 13. this was in the center of the geocentric model
- 14. planets known as Gas giants
- 15. shape of planet's orbit
- 19. outer planet completely tilted on its side