Across
- 3. age of most stars in irregular galaxies
- 4. galaxy shaped like a lens or a lentil
- 8. rotating galaxy with arms
- 9. how the universe is getting bigger
- 11. the "fat" center of a galaxy
- 13. galaxy shaped like an egg
- 14. force that holds galaxies together
Down
- 1. all space, matter, time, and energy
- 2. systems of planets surrounding a star
- 5. galaxy with no definite shape
- 6. a huge ball of gas producing own energy
- 7. age of most stars in elliptical galaxies
- 10. a huge cloud of gas and dust
- 12. distance light travels in 1 year