Across
- 2. region where stars are born
- 6. standard distance
- 7. electromagnetic radiation
- 8. collapsed under gravity
- 9. small star
- 10. actual brightness
- 12. gigantic explosion
Down
- 1. all matter and energy
- 3. 9.46 trillion kilometers
- 4. relationship of temp and absolute magnitude
- 5. brightness of star
- 11. collection of stars