space

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Across
  1. 5. start of expansion
  2. 8. fusion of h2 and hE
  3. 11. tells us galaxies are moving away
  4. 12. apparent shift
  5. 15. stream of charged particles
  6. 16. loop of gas
  7. 18. 1 trillion miles
Down
  1. 1. young stars in the arms
  2. 2. warm rises, cool sinks
  3. 3. collapsed neutron star no light escapes
  4. 4. cooler areas on the surface
  5. 6. hottest layer of an atmosphere
  6. 7. collapsed core of a high mass star
  7. 9. full of old stars
  8. 10. cloud of gas and dust
  9. 13. squeezing atoms together
  10. 14. the rasins spread apart as the bread rise
  11. 17. bright center of a distant galaxy