Life cycle of a star

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Across
  1. 2. being flat and circular in shape
  2. 5. Bigger than galaxy
  3. 6. much larger and bigger stars
  4. 7. among the largest brightest stars
  5. 8. Where we live
  6. 11. A classification of star
  7. 12. next stage of whitedwarf
Down
  1. 1. vast cosmic systems of stars and planets
  2. 3. joining two things
  3. 4. brightness of an object
  4. 9. hot remnant of star
  5. 10. interaction between 2 nuclear particles