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