Life Cycle of Stars

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Across
  1. 6. very dense collection of gas and dust
  2. 7. collection of gas and dust
  3. 9. how bright a star is
  4. 10. main portion of the life of a star
Down
  1. 1. star
  2. 2. energy that is the fundamental energy of stars
  3. 3. very dense star
  4. 4. Actual brightness of a star
  5. 5. one happens every 50 years in the galaxy
  6. 6. particles of light
  7. 8. Brightness of a star as it appears