Across
- 7. round or flattened balls or odd stars
- 9. a large cloud of dust and gas
- 11. patterns in the night sky
- 13. a spiral galaxy
- 14. has a bulge in the middle
- 15. active young galaxies with black holes in the center
Down
- 1. a huge group of single stars
- 2. distance that light travels in one year
- 3. most stars are members of groups.
- 4. measure of the amount of light received on earth
- 5. the range of wave lengths that stars emit
- 6. they are made by contracting gas and dust
- 8. made when stars run out of fuel
- 10. began 13.7 billion years ago
- 12. no regular shapes bright young stars