cross word

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Across
  1. 2. the star gets brighter then explodes
  2. 4. brightness seen from earth
  3. 6. blue-white core that is left behind and cools
  4. 8. all space and everything inside of it
  5. 9. distance that light travels in one year
  6. 11. universe formed in a instant
Down
  1. 1. a cloud of gas and dust with enough mass to form a star
  2. 3. stars brightness if it was standard distance from earth
  3. 5. a group of single stars
  4. 7. more accurate scale of the entire solar system
  5. 10. a large cloud of gas and dust