Universe, Stars, and Galaxies

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