Across
- 4. Hottest planet among the inner planets
- 6. Planet most fit for life
- 7. Describes the inner planets
- 8. What most of the planets have, yet very few or none for the inner planets
- 9. Planet closest to the Sun
Down
- 1. Distance
- 2. Is thin in some planets, thick in others, and nonexistent in the rest
- 3. The inner planets are to one another
- 5. The revolution of the planets around the Sun
- 8. Is the inner planet farthest from the Sun