GALAXY

2. the increase in wavelength that light undergoes as a result of traveling through an expanding universe
4. unit of measurement used to describe the expansion of the universe
5. star system that has a core of emission embedded at the center
7. pulsating star that changed in brightness
10. a structure that consists of hundreds of thousands of galaxies bound together by gravity
13. cosmic rebels, lacks a distinct shape, appearing chaotic
14. globular cluster of stars
15. unusual shapes, characteristics, such as rings and tails set them apart

1. bar shaped structure extends from the bulge spiral arms sprout from the ends of the bar
3. central bulge, pinwheel like, make up about 60% of galaxies
6. a tightly packed group of stars within a larger star formation
8. flat, circular region of a spiral galaxy
9. smooth, featureless appearance can range in shape
10. system of stars bound together by gravity
11. smaller system that consists of galaxies bound together by gravity
12. the observation that galaxies are moving away from earth at speeds proportional to their distance