Across
- 1. football-shaped galaxy.
- 4. yellow thing in the middle of our galaxy.
- 6. galaxy with "arms".
- 7. Milky Way.
- 8. group of planets.
- 10. galaxy with no consistent shape.
Down
- 2. distance from the Earth to the Sun.
- 3. most powerful energy source.
- 5. Holding together all of the materials that make a galaxy.
- 9. 15 billion years old