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