mason's crossword

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Across
  1. 2. matter we can't see but, we know exist
  2. 3. a violent explosion that occurs when a star's core succumbs to gravity
  3. 6. all stars systems, galaxies, dust and gas
  4. 9. a force of gravity that even light can't escape
  5. 12. groups of hundreds to thousand of stars
  6. 13. appears to be a rotating disk of dust and stars
  7. 14. our galxay's name
  8. 15. a glowing gas ball of high tempatures
Down
  1. 1. stars grouped closely together
  2. 4. egg shaped rotating galaxies
  3. 5. begining of the exsistance of the uneverse
  4. 7. gravitational collapse cause the core to shrink into small glowing sphere
  5. 8. group of stars
  6. 10. arms that spiral around a spiral galaxy
  7. 11. giant red star collapsing inwards on it's self