Across
- 2. empty space
- 4. galaxy with arms in a pinwheel pattern
- 6. everything that exists
- 10. expectation that something always happens
- 11. believed to be true but not absolutely proven
- 12. large group of stars, gas, and dust
Down
- 1. educated guess
- 3. galaxy with no regular shape
- 5. bang theory of how universe began
- 7. galaxy that is round or oval
- 8. way spiral galaxy Earth is located in
- 9. what scientists can see