Across
- 2. method of measurement for stars
- 6. a lot of stars held together by gravity
- 8. two stars orbiting each other
- 11. group of hundreds or thousands of stars
- 12. study of the universe
- 13. our galaxy
Down
- 1. dense, light cannot escape
- 3. group of stars
- 4. stars core changes to a white glowing sphere
- 5. ball of glowing gas
- 7. all of the star systems, galaxies, dust
- 9. stars that are grouped closely together
- 10. biggest group of stars
- 11. explosion that occurs with a star's core