Across
- 2. oldest star known to astronomers
- 3. explosion of a massive star
- 4. imaginary pattern made of stars
- 5. Hertzsprung-Russell diagram
- 6. the most common star
- 12. final stage of an average star's life
Down
- 1. expanding dust and gas
- 7. extremely dense object created in supernova
- 8. a thermonuclear explosion contained by gravity
- 9. massive stars expand to become ___________.
- 10. a tool used to observe the stars
- 11. cooled white dwarf