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