Across
- 4. a large round thing in space that goes around a star
- 5. small pieces of something like powder
- 7. 1,000,000,000
- 8. a space with no air or anything else inside
- 11. how far light goes in a year (2 words)
- 12. a big group of stars
- 13. go in a circle
Down
- 1. can be seen
- 2. has nothing inside
- 3. air is a _____
- 6. many planets going in a circle around a star (2 words)
- 9. stars, planets, galaxies, and everything
- 10. dangerous energy