Across
- 2. brightness a star's brightness seen from earth
- 4. large cloud of gas and dust
- 7. look over
- 10. first stage in a star's formation
- 11. brightness star's brightness if it was closer to earth
- 12. theory that the universe formed in an instant
Down
- 1. an explosion from a super giant
- 3. group of single stars, star systems, star clusters, dust, and gas
- 5. blue dwarf that cools
- 6. all of space and everything in it
- 8. is the distance that light travels in one year
- 9. figure out