Across
- 1. red-colored star that is collapsing inward on itself
- 4. appear as a rotating disk of stars and dust
- 5. our galaxy
- 11. galaxies that are not spiral or elliptical
- 13. ball of glowing gas that at a very high temperature
- 14. stars that are grouped closely together
- 15. arms that spiral outward off of spiral galaxies
Down
- 2. biggest group of stars
- 3. egg shaped rotating galaxy
- 6. this is so dense that light cannot escape the gravity
- 7. nuclei of two atoms combine to form a new atom
- 8. all of the star systems, galaxies, gas and dust
- 9. two stars orbiting each other
- 10. group of stars
- 12. the study of the universe