Across
- 3. arms that spiral outward off of spiral galaxies
- 4. ball of glowing hot gas
- 9. egg shaped
- 10. group of stars
- 11. galaxy that is not spiral or eliptical
- 12. the study of the universe
- 14. a large red star collapsing on itself
- 15. system stars that are grouped together
Down
- 1. all of the star sytems, galaxies, gas, and dust
- 2. our galaxy
- 5. the widley accepted theory
- 6. appear as a rotating disk of stars and dust
- 7. two stars orbit eachother
- 8. this is so dense that light can't escape
- 13. clusters groups of hundreds or thousands of stars