Across
- 5. What gives of negative charge?
- 6. What gives a positive charge?
- 10. Determines the life cycle of a star.
- 13. Two lighter elements that fuse to create heavier.
- 14. Percentage of hydrogyn.
- 15. Percentage of helium.
Down
- 1. What takes place inside the core of a star?
- 2. About how old is our universe?
- 3. How many neutrons can the first valance ring hold?
- 4. What gives off no charge?
- 7. Average size star.
- 8. The name of the galaxy we live in.
- 9. The third most abundant element in the universe?
- 11. How many neutrons can the second valance ring hold?
- 12. The displacement of spectral lines toward longer wavelengths.