Across
- 3. never a certain structure or size
- 5. football shaped galaxy with trillions of stars
- 6. clouds of dust and gas in outer space
- 8. clusters: a cluster of billions of stars bound together by mass and gravity
- 10. center: which can trigger phenomena like rapid star formation
Down
- 1. galaxies: sit between elliptical and spiral
- 2. center bulge with "arms"
- 4. clusters: formed from smaller clusters of about one million stars
- 7. are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars held together by gravity
- 9. way: 10 million light-years across that also includes the Andromeda galaxy and its satellites