Nemesis 4th

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