Sun and Stars

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Across
  1. 3. rapidly spinning neutron stars
  2. 5. the cooler core of a star that is left behind
  3. 7. Burning ball of gas
  4. 9. Hottest color for a star
  5. 10. Charged particles coming from the sun
  6. 13. the brightness as seen from earth
  7. 14. Center, hottest part of the sun
  8. 16. inner layer
  9. 17. remains of a high-mass star
  10. 18. a large cloud of gas and dust
  11. 20. the color of our sun
  12. 21. explosion and brightness when a supergiant runs out of fuel
  13. 22. eruptions of gas and magnetic energy
Down
  1. 1. huge loops of gas on the sun
  2. 2. dark, cool spots on the sun
  3. 4. in the H-R diagram, the diagonal where most of the stars are
  4. 6. H and He coming together and creating energy
  5. 8. the actual brightness if it was where the sun is
  6. 9. an object with gravity so strong nothing can escape it
  7. 11. Coolest color for a star
  8. 12. the beginning of a star
  9. 15. middle layer
  10. 19. Outer layer