Across
- 3. The sun cannot produce elements heavier than this element
- 5. A developing star not yet hot enough to engage in nuclear fusion
- 8. The second stage of a star's evolution
- 9. The only energy source of low-mass stars
- 10. Found in the constellation Taurus, by the Chinese; remains of a supernova that took place in 1054
- 12. The process that produces chemical elements inside stars
- 13. The remains of a dead or collapsed star
Down
- 1. The galaxy in which we live
- 2. The death of a star; explosion
- 4. The force that causes stars to eventually run out of fuel and collapse
- 6. Beautiful, gleaming spherical clouds; white dwarfs heat these clouds
- 7. The dark, cool birthplaces of stars; interstellar clouds
- 11. Stage that occurs because the zone of hydrogen fusion continually moves outward, leaving behind a helium core