Across
- 4. A very well known constellation
- 5. A shock wave that travels outward
- 6. Has the most constellations
- 8. Active young galaxies w/black in the center
- 10. A region where nothing can escape from
- 11. distance that light travels in one year
- 13. has bulge in middle and arms that spiral outward
- 14. Large cloud of gas and dust
Down
- 1. The brightest star in the night sky
- 2. The range of wave lengths that stars emit
- 3. A dense star
- 7. round or flattened balls, old stars only
- 9. Instruments scientists use to spread light
- 12. no regular shapes, bright young stars