Stars

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Across
  1. 2. zone layer of the sun
  2. 3. hole supergiant explodes
  3. 6. glowing sphere of gases
  4. 9. outermost layer of the sun
  5. 10. high energy
  6. 13. fusion merging together of nuclei atoms
  7. 14. tremendous explosion
  8. 15. zone electromagnetic waves
  9. 16. dwarf mid-sized star
  10. 18. cluster of stars
  11. 19. star massive star
Down
  1. 1. visible surface
  2. 4. thin layer of the sun's atmosphere
  3. 5. method used by astronomers
  4. 6. prominence sunspots
  5. 7. fusion reaction two nuclei fuse together
  6. 8. flare violent explosion
  7. 11. light
  8. 12. giant stage in a star's development
  9. 17. sequence star hydrogen atoms to helium