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