Across
- 2. small dark spot
- 4. has no atmosphere
- 7. 1 day only last 17 hours
- 8. has a greenhouse effect
- 10. the study of moon,stars and other objects
- 12. many moons,great red spot.
Down
- 1. chunks of rock or dust in space
- 3. less dense than water
- 5. chunks of ice and dust
- 6. has ice caps
- 9. only planet with life
- 10. rocky debris revolving around the sun
- 11. center of the solar system