Across
- 2. contains more than 200 billion stars
- 4. larger region in space
- 7. near the edge of a galaxy
- 8. nothing can escape from it
- 9. shaped like disks
Down
- 1. shaped like spheres
- 3. contains billions of stars, dust and gas
- 4. sphere of hot gases
- 5. distance light travels in one year
- 6. exploding star