Juice box 4th

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Across
  1. 2. raisins spreading
  2. 5. moving away galexies
  3. 8. cloud of gas and heat
  4. 10. apparent shift
  5. 11. collapsed core
  6. 13. fusion of h2 and he
  7. 15. stream of changed particles
  8. 17. old center young arms
  9. 18. how fast light travels in a year
Down
  1. 1. new stars
  2. 3. cooler on surface
  3. 4. squeezing atoms together
  4. 6. hottest layers
  5. 7. light centering
  6. 9. warm rises cool sinks
  7. 10. loop of gas
  8. 12. old stars
  9. 14. start of time
  10. 16. collapsed neutron star