Scoops 4th

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Across
  1. 5. all old stars
  2. 6. collapsed neutron star, no light escapes
  3. 13. stream of charged particles
  4. 14. smallest of galaxies no specific shape
  5. 15. warm rises cool sink
  6. 17. bright center of a distant galaxy
  7. 18. cooler areas on surface
  8. 19. loop of gas
Down
  1. 1. 9 trillion miles
  2. 2. fusion of H2 and He
  3. 3. the raisins spread apart as the bread rises
  4. 4. circle
  5. 7. start of expansion
  6. 8. tells us galaxies are moving away
  7. 9. collapsed core of a high mass star
  8. 10. hottest layer of atmosphere
  9. 11. Squeezing atoms together
  10. 12. apparent shift
  11. 16. cloud of gas and dust