bad dog p4

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