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