Across
- 2. stars that are grouped closely together
- 5. groups of hundreds or thousands of stars
- 7. so dense that light cannot escape the gravity
- 8. two stars orbiting each other
- 10. appear as a rotating disk of stars and dust
- 11. group of stars
- 14. the study of the universe'
- 15. gravitation collapse shrinksthe star's core to a white glowing sphere
Down
- 1. galaxies that are not spiral or elliptical
- 3. arms that spiral outward off of spiral galaxies
- 4. nuclei of two atoms combine to form a new atom
- 6. egg shaped galaxy
- 9. all of the star systems galaxies gas and dust
- 12. ball of glowing gas at a very high temperature
- 13. our galaxy