Bristol 1

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Across
  1. 1. fusion of H2 and Helium
  2. 3. bright center of a disant galaxy
  3. 7. 9 trillion miles
  4. 10. tells us galaxies are moving away
  5. 12. stream of charged particles
  6. 15. warm rises, cool sinks
  7. 16. apparent shift
  8. 17. cloud of gas and dust
  9. 18. start of expansion
Down
  1. 2. irregular shape
  2. 4. the raisins move apart as the bread rises
  3. 5. squeezing atoms together
  4. 6. loop of gas
  5. 8. young stars in arms, and old stars in middle
  6. 9. collapsed core of high mass star
  7. 11. old stars
  8. 13. hottest layer of atmosphere
  9. 14. cooler areas on surface