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Across
  1. 7. aircraft with spinning blades
  2. 8. one color
  3. 9. moving forward step by step
  4. 10. relating to space
  5. 11. a shiny metal used for color and coating
  6. 13. helix the spiral shape of DNA
  7. 15. a worker
  8. 17. spiral
  9. 19. step
  10. 22. lasting for a short time
  11. 23. rule
  12. 27. a spiral shape
  13. 28. work together
  14. 30. universe / world
  15. 31. worldly; connected to many cultures
  16. 33. color
  17. 35. something that produces power
  18. 36. measure linked to time/weather conditions
  19. 38. a group born around the same time
  20. 39. the universe
Down
  1. 1. requiring hard work
  2. 2. time
  3. 3. government run through offices/rules
  4. 4. birth
  5. 5. relating to a general kind
  6. 6. study of the universe
  7. 12. relating to time
  8. 14. a place for scientific work
  9. 16. happening step by step
  10. 18. shaped like a spiral
  11. 20. to step away from the main topic
  12. 21. rule by the people
  13. 24. member of the ruling upper class
  14. 25. a DNA structure (means “colored body”)
  15. 26. rule by one person
  16. 29. work
  17. 32. living at the same time
  18. 33. a group that meets/steps together
  19. 34. to produce or create
  20. 37. relating to color