galaxies words

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Across
  1. 3. triggered a burst of stars formaton
  2. 8. orbital speed of stars
  3. 9. to find the mass of the galaxy
  4. 11. when light from a distant object passes nearby a massive object
  5. 14. cloud of turbulant gas
  6. 15. was first called quasi-stellar
Down
  1. 1. contains most of the galays stars
  2. 2. measurment of the distance
  3. 4. highly luminous nuclei with pecular spectra
  4. 5. flattened cloud of billion stars
  5. 6. hard to observe directly
  6. 7. does not absorb light or emit
  7. 10. use to find distance of galaxy
  8. 12. contains thousand or more galaxies
  9. 13. relation between apparent velocity of ression and distance