Across
- 1. large cloud of gas in space
- 7. distance that light travels in a year
- 8. frequencies of electromagnetic radiation
- 10. a collection of stars
- 11. hot dim star
- 12. BOOM!
Down
- 2. how bright a star would be up close
- 3. space and all the matter in it
- 4. brightness of a star
- 5. star that has collapsed
- 6. relationship between a stars temperature and absolute magnitude
- 9. actual brightness of a star