Across
- 2. large cloud of gas and dust in space
- 4. distance light travels in a year
- 6. relationship between a star's surface temperature and absolute magnitude
- 7. brightness of star from standard distance
- 8. collection of stars, dust, and gas combined
- 10. brightness of a star seen from earth
Down
- 1. frequencies and wavelengths
- 3. huge explosion of a star
- 4. real brightness of a star
- 5. space and all matter and energy in it
- 9. hot dim star
- 11. a star that has collapsed under gravity