LIFE CYCLE OF STAR

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Across
  1. 2. lightest element
  2. 5. longest lived of the objects in the unverse
  3. 7. exist in outer space, measure 0.1mm
  4. 9. matter and radiation that exist in the space between the star systems in a galaxy
  5. 12. creation of chemical elements by nuclear fusion reactions within stars
  6. 13. light and heat from stars is made
  7. 14. what is left when stars have exhausted all fuel
  8. 15. very young star
Down
  1. 1. luminous and short lived
  2. 3. collapsed core of a massive supergiant star
  3. 4. theoretical stellar remnant
  4. 6. place in space where gravity pulls so much that even light can not get out
  5. 8. biggest explosion that humans have ever seen
  6. 10. any star that has a hot, dense core
  7. 11. luminescent part of interstellar medium
  8. 16. dying star in the final stages of stellar evolution