Pinky Pie 4th

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