Space crossword

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Across
  1. 3. The second element
  2. 4. giant
  3. 8. a big star
  4. 10. before the black hole
  5. 11. hole collapsed star core
Down
  1. 1. the time that light travels at
  2. 2. a star
  3. 3. an element
  4. 5. the smallest star type
  5. 6. ___ fusion
  6. 7. a single ___
  7. 9. how long the star lives
  8. 12. a unit of temperature