Across
- 3. how we know the universe is expanding
- 5. forms from gravity
- 6. contains most of the stars, gasses, and dust
- 8. flattened cloud of billions of stars
- 10. mass that is invisable
- 13. about 3300 light years
- 14. what astronomers use to say both the halo and central bulge
Down
- 1. orbital velocity versus radius
- 2. are rich in metal
- 4. how we determine a galaxy's distance
- 7. how we identify the different galaxies
- 9. when light passes a massive source of gravity it gets pulled
- 11. spherical cloud of stars and star clusters
- 12. contain a thousand more galaxies