Elias' Chapter 15 and 16 crossword puzzle

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Across
  1. 2. A galaxy that ha no definite shape
  2. 4. Chemicals that are heavier than helium in astronomy
  3. 8. A galaxy with a fluffy appearance
  4. 10. A galaxy with little to no gas and stars
  5. 11. stars that contain 2-3% metals
  6. 12. The part of a galaxy that is made of stars and star clusters
  7. 13. The center of a galaxy
Down
  1. 1. Matter that makes up most of the universe and does not absorb nor reflect light
  2. 3. The part of a galaxy where most of the stars and gas are held
  3. 5. A unit of measurement about 3300 light-years long
  4. 6. A galaxy that has symmetric two armed patterns
  5. 7. stars that contain less than 0.1% metals
  6. 9. A galaxy that has spiral arms that wind out from the nucleus