Across
- 2. stars dust and gas bound together by gravity
- 4. Star collapses under gravity
- 5. Brightness of a star from standard distance
- 7. Brightness of star from as seen from Earth
- 8. space and everything in it
- 11. The actual brightness of a object such as a star
- 12. Hertzsprung-Russel diagram
Down
- 1. all of the frequencies or wavelengths
- 3. large cloud of gas and dust in space; stars are born
- 6. a gigantic explosion in which massive star collapses
- 9. Distance that light travels in a year
- 10. Small dim star that is left over center of older star