Across
- 3. the most distant planet from the Sun.
- 4. No planet has sparked the imaginations of humans
- 7. first planet so far away from the Earth
- 8. the first of the gas giant planets
Down
- 1. planet made mostly of rock
- 2. is the one most similar to Earth
- 5. is the second largest planet
- 6. the only planet known where life exists