Across
- 6. a pattern of stars
- 7. most orbit the sun
- 9. round or flattened balls, old stars only
- 10. made of mainly rocky material
- 12. millions of small rocky objects
- 13. active young galaxies w/black holes in the center
- 14. made of ice and gas
- 15. has a bulge in the middle and arms that
Down
- 1. debris left by colliding asteroids
- 2. an ethic group in mail, west Africa
- 3. no regular shapes, bright young stars
- 4. one of the star characteristics
- 5. the range of wave lengths that stars emit
- 8. instrument scientist use to spread right
- 11. made of gas, dust and ice
- 14. a huge group of single stars