Star Cycle

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Across
  1. 4. Hot dense core star.
  2. 7. Explosion of a star.
  3. 9. no longer emit light.
  4. 10. stellar core remnant.
  5. 11. most massive stars.
  6. 12. Large barred spiral galaxy.
Down
  1. 1. larger radii and luminosity.
  2. 2. Everything.
  3. 3. Change in identity.
  4. 5. Total amount of electromagnetic energy.
  5. 6. Cloud of dust and gas.
  6. 8. Two or more atomic nuclei combine.