chapter 15 and 16

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