Across
- 2. planet next to Moon
- 4. seen at night
- 7. red planet
- 9. gravitationally bound system of stars
- 10. something that falls to the surface of a planet
- 11. the name of our planet
Down
- 1. the largest planet in the solar system
- 3. the first cosmonaut
- 5. region beyond the solar system
- 6. the opposite of earth
- 8. an object placed into orbit in outer space