Across
- 2. A cloud of gas and dust kept together by gravity
- 3. the "middle age" stars belong to this group
- 5. a galaxy that has "arms"
- 6. a cloud of gas dust that creates stars
- 8. the final stage of a massive star where it explodes
- 9. the invisible force that keeps things in place.
Down
- 1. a oval shaped galaxy
- 4. a galaxy that has no defineable shape
- 7. the result of a collapsed giant star that has a huge amount of mass
- 8. a sphere of gas that is extremely hot and bright