Ellie8

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