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