JB8

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Across
  1. 2. Loop of gases
  2. 3. Cooler areas on surface
  3. 6. apparent shift
  4. 11. Collapsed core and high mass
  5. 12. Small galaxies
  6. 13. Warm rises and cool sinks
  7. 15. Cloud of gas and dust
  8. 17. Hottest layer of atmosphere
  9. 18. The raisins spread apart as the bread rises
Down
  1. 1. Squeezing atoms together
  2. 3. Stream of charged particles
  3. 4. Fusion of H2 and He
  4. 5. Collapsed neutron star no light escapes
  5. 7. Old stars in middle, young stars in arms
  6. 8. Tells us galaxies are moving away
  7. 9. Bright center of a distant galaxy
  8. 10. 6 trillion miles
  9. 14. All old stars
  10. 16. Start of expansion