Across
- 5. mercury, venus, earth, mars
- 6. the only planet known to support life
- 7. earths sister planets
- 9. terrestrial planets ranges in thickness and in composition
- 10. planets that are like earth in some way
Down
- 1. an celestial object
- 2. the planets that are larger then earth
- 3. moved repeatly around
- 4. the red planet
- 8. the planet that is 50% in earths size