Across
- 2. the distance light travels in a year
- 5. a collection of stars dust, planets, etc.
- 8. Frequencys and wavelengths
- 9. a star that has collapsed under gravity
- 10. an old white center of a star that died
- 11. space and all the matter and energy in it
- 12. a large cloud of gas and dust where stars are born
Down
- 1. diagram that shows stars brightness and intensity
- 3. brightness of a star as if it were seen from a regular distance
- 4. the brightness of a star seen from earth
- 6. actual brightness of a star
- 7. a big explosion in which a massive star explodes and spreads its contents into space