Ella8

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Across
  1. 2. 9 trillion miles
  2. 6. bright center of a distant galaxy
  3. 9. galaxy with young stars in arms, old stars in the center
  4. 10. tells us galaxies are moving away
  5. 12. warm rises, cool sinks
  6. 15. cloud of gas and dust
  7. 16. loop of gas
  8. 18. apparent shift
  9. 19. squeezing atoms together
Down
  1. 1. the rasins spread apart as the bread rises
  2. 3. smallest galaxies
  3. 4. odval shaped galaxy with old stars
  4. 5. stream of charged particles
  5. 7. cooler areas on surface
  6. 8. start of expansion
  7. 11. sequence fusion of h2 to he
  8. 13. hottest layer of atmosphere
  9. 14. collapsed core of a high-mass star
  10. 17. collapsed neutron star, no light escapes