Across
- 6. very dense collection of gas and dust
- 7. collection of gas and dust
- 9. how bright a star is
- 10. main portion of the life of a star
Down
- 1. star
- 2. energy that is the fundamental energy of stars
- 3. very dense star
- 4. Actual brightness of a star
- 5. one happens every 50 years in the galaxy
- 6. particles of light
- 8. Brightness of a star as it appears