Galaxy and Stars vocabulary

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Across
  1. 3. planetary nebula's core compressed
  2. 5. stage after supernova
  3. 6. the brightness of a star
  4. 8. the brightness of a star
  5. 13. cool giant star, late in it's life cycle
  6. 15. star constellation in the north hemisphere
  7. 16. stars grouped together
  8. 17. the distance light travles in a year
  9. 18. the earliest stage of a stars life
Down
  1. 1. a large cloud of hydrogen, helium and dust
  2. 2. the galaxy we live in
  3. 4. the Milky Way
  4. 7. a cloud of dust and gas that forms stars
  5. 9. where stars form
  6. 10. galaxy with old stars
  7. 11. stage stars spend majority of their life in
  8. 12. galaxy with no definate shape
  9. 14. north star