Lillian 8

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