Reagan 4th

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