Across
- 2. combining elements into larger elements
- 4. the distance light can travel in one year
- 8. A rocky or gaseous sphere orbiting a star
- 10. the remains of a star after fusion stops
- 12. brightness of the star
- 13. a collection of old stars in the shape of a sphere
- 14. categorizes stars based on temperature and luminosity
- 16. a star that is using hydrogen and helium
- 17. A large collection of stars
Down
- 1. rotating collection of stars with a black hole in the center
- 3. the birthplace for stars
- 5. A ball of gas fusing into heavier elements
- 6. a star that has expanded and fuses heavier elements
- 7. is a collection of young stars with no specific shape
- 9. A large collection of gas and dust
- 11. a collapsed star with high mass and gravity
- 15. System All objects orbiting a star