Across
- 4. the collection of eight planets and their moons in orbit around the sun
- 6. the force of attraction between all masses in the universe
- 8. Saturn
- 9. Neptune
Down
- 1. torus-shaped region in the Solar System
- 2. all existing matter and space considered as a whole;
- 3. Jupiter
- 5. the outside part or uppermost layer of something
- 7. the envelope of gases surrounding the earth or another planet