Thomas P8

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Across
  1. 5. collapsed core of a high-mass star
  2. 8. warm rises cool sinks
  3. 9. no shape
  4. 11. young bright stars in the arms, old in the center
  5. 12. cooler areas on surface
  6. 15. raisins move apart as the bread rises
  7. 16. apparent shift
  8. 17. collapsed neutron star no light escapes
  9. 18. 9 trillion miles
  10. 19. loop of gas
Down
  1. 1. fusion of H and He
  2. 2. start of expansion
  3. 3. sqeezing atoms together
  4. 4. bright center distant galaxies
  5. 6. tells us galaxies are moving apart
  6. 7. all old stars
  7. 10. stream of charged particles
  8. 13. layer of armosphere
  9. 14. cloud of gas and dust