spacee

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Across
  1. 4. fusion of H2 and He
  2. 6. bright center of a distant galaxy
  3. 8. full of old stars
  4. 13. squeezing atoms together
  5. 14. tells us galaxies are moving away
  6. 15. hottest layer of atmosphere
  7. 18. young stars in the arms
Down
  1. 1. loop of gas
  2. 2. wild patterns of stars
  3. 3. collapsed neutron star no light escapes
  4. 5. cloud of gas and dust
  5. 7. a collapsed core of a high mass star
  6. 9. 1 trillion miles
  7. 10. the raisins spread apart as bread rises
  8. 11. cooler areas on surface
  9. 12. start of expansion
  10. 15. warm rises, cool sinks
  11. 16. stream of charged particles
  12. 17. apparent shift