Bella A 1st

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Across
  1. 3. warm rises cool sinks
  2. 9. outer stars hot and young and inner older
  3. 11. star collapsed core of high mass star
  4. 12. 9 trillion years
  5. 14. apparent shift
  6. 16. bang start of expansion
  7. 18. loop of gas
  8. 19. shape that is not normal
Down
  1. 1. cooler areas on surface
  2. 2. wind stream of charged particles
  3. 4. all old
  4. 5. hottest layer of atmosphere
  5. 6. bright center of a distant galazies
  6. 7. squeezing atoms together
  7. 8. raisins spread apart as the bread rises
  8. 10. sequence fusion of H, and He
  9. 13. hole collapsed neutron star no light escapes
  10. 15. pulls us galaxies are moving away
  11. 17. cloud of gas and dust