Stars, Galaxies, and Universes

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Across
  1. 4. nuclear fusion in the Star's core produces helium from hydrogen our galaxy
  2. 6. this is so dense that light cannot escape the galaxy
  3. 7. biggest groups of stars; may contain hundreds of thousands of stars
  4. 12. egg-shaped rotating galaxy
  5. 13. groups of stars
  6. 14. the leftover material in the core after a SuperNova explosion
  7. 15. a violent explosion that occurs when a star's core succumbs to gravity
Down
  1. 1. all of the star systems, galaxies, gas a dust
  2. 2. arms that spiral outward off of spiral galaxies
  3. 3. groups of up to a few thousand stars that are loosely held by gravity
  4. 5. as a rotating disk of stars and dust
  5. 8. the study of the universe
  6. 9. of hundreds or thousands of stars
  7. 10. our galaxy
  8. 11. two stars orbiting each other