chapter 15 and 16

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Across
  1. 3. time in years equal to the distance in light years from different stars
  2. 5. are rich in metal containing 2 to 3 present metal
  3. 7. when light passes by an object with greater gravity it gets deflected
  4. 9. are bright when in infrared
  5. 11. how we sort galaxies
  6. 12. hold more than a thousand galaxies
  7. 14. mass that is invisible and does not absorb light or emitt
  8. 15. contain clouds of dust and glasses and young star clusters
Down
  1. 1. is about 3300 ly
  2. 2. contains most of the stars, dust, and gasses in the galaxy
  3. 4. distort eachother
  4. 6. looks like a star but its spectra is completely different
  5. 8. a way for us to estimate distance
  6. 10. are bright when shown with radio wavelengths
  7. 13. its how we show that the universe is expanding