Across
- 2. seventh planet from the sun
- 4. the distance travelled by light in one year
- 5. natural satellite of the Earth
- 6. a planet so light that it can float in water
- 7. biggest star in the solar system
- 9. our home galaxy
Down
- 1. the last dicovered planet in the solar system
- 3. small rocky objects that orbit the sun
- 5. the planet closest to the sun
- 8. one of the four inner planets.