Bryan Cruz Milky Way Crossword.

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Across
  1. 3. Young, blue stars with high heavy-element content
  2. 7. glowing cloud of ionized, hot gas that emits its own light
  3. 8. A large, roughly spherical region surrounding the entire disk/bulge
  4. 9. The use of natural microwave lasers to map distances and motion within the
  5. 10. The area of the night sky obscured by the Milky Way's own dust and stars
  6. 13. A theory explaining that spiral arms are not fixed structures, but rather moving waves
  7. 15. The galaxy that houses our universe
Down
  1. 1. Old, red stars with low heavy-element content
  2. 2. spherical, ancient group of thousands to millions of stars in the halo
  3. 4. Theoretical first generation of stars formed after the Big Bang
  4. 5. The thick, spherical concentration of old, red stars at the very center of the galaxy.
  5. 6. cloud of dust that shines by reflecting the light of nearby, younger, hot stars
  6. 11. A loose, young group of dozens to thousands of stars in the disc
  7. 12. dense cloud of dust and gas that blocks the light from stars behind it
  8. 14. The flat, rotating, pancake-shaped part of the galaxy containing stars, gas, and dust where new stars form.