Across
- 2. a collection of stars
- 8. everything!
- 9. layer of gas
- 12. a star and orbiting planets
- 13. the force that pulls everything together
Down
- 1. an object that orbits a planet
- 3. ball of gas that gives out light
- 4. has a tail
- 5. a planet that is a large gas ball
- 6. hypothesis on the origins of the universe.
- 7. a dwarf planet
- 10. usually has irregular shape
- 11. we have one of these