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Across
  1. 1. single-cell organisms
  2. 4. force per area
  3. 7. an explanation idea
  4. 12. a tiny life form
  5. 13. scientific temperature scale
  6. 15. stored electric power
  7. 17. science of substances
  8. 18. a tiny particle type
  9. 25. metric temperature scale
  10. 26. hot charged gas
  11. 27. a path around a body
  12. 30. an icy space object
  13. 32. a vehicle in space
  14. 34. a math machine
  15. 37. empty space
  16. 38. a huge star system
  17. 39. a rocky space body
  18. 41. a reusable spacecraft
  19. 43. an electric path
  20. 44. a tool to see far
  21. 45. long-term weather
  22. 49. science of space
  23. 51. time of year
  24. 54. science of matter and energy
  25. 55. science of life
  26. 56. a body molecule
  27. 58. a negative particle
  28. 62. a focused light beam
  29. 64. a spinning engine part
  30. 66. weather prediction
  31. 67. a metal-attracting object
  32. 69. physical substance
  33. 71. a neutral particle
  34. 72. too much water
  35. 74. a size-only quantity
  36. 75. an object in orbit
  37. 77. power-making machine
  38. 78. a set of instructions
  39. 81. a light particle
  40. 83. a falling space rock
  41. 84. a scientific test
  42. 85. a number grid
Down
  1. 2. a space vehicle
  2. 3. power to do work
  3. 5. sound-based detection
  4. 6. a spinning storm
  5. 8. a strong storm
  6. 9. a body structure
  7. 10. science of earth
  8. 11. having magnetic force
  9. 14. a math rule
  10. 16. a giant sea wave
  11. 19. a tiny unit of matter
  12. 20. a positive particle
  13. 21. a cloud in space
  14. 22. a space traveler
  15. 23. a spacecraft section
  16. 24. a range of light
  17. 28. a tool to see small
  18. 29. polar light display
  19. 31. a living thing
  20. 33. a math statement
  21. 35. amount of matter
  22. 36. a rotating machine
  23. 40. a pulling force
  24. 42. living environment system
  25. 45. the universe
  26. 46. ground shaking
  27. 47. a remote flying machine
  28. 48. body cell groups
  29. 50. a radio detection system
  30. 52. a charged atom
  31. 53. heat level
  32. 57. lack of rain
  33. 59. a tiny piece of matter
  34. 60. a visual chart
  35. 61. a transmitted message
  36. 62. a science room
  37. 63. to imitate reality
  38. 65. a directed quantity
  39. 68. a mountain that erupts
  40. 70. a reaction helper
  41. 73. a group of atoms
  42. 76. a small space cabin
  43. 79. genetic information
  44. 80. a step-by-step method
  45. 82. a detecting device