Astronomy

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Across
  1. 3. Intrinsic brightness
  2. 5. Light rainbow
  3. 10. Star wobble
  4. 11. Metallic heart of Earth
  5. 13. Zone for liquid water
  6. 16. Plate going under another
  7. 20. Look straight up!
  8. 23. Belt beyond asteroids
  9. 24. Equal day and night
  10. 25. Study of light
  11. 28. An overshadow
  12. 32. Sharpness of vision
  13. 35. Strong oscillating waves
  14. 36. Occasionally showers Earth
  15. 37. Planet hiding behind star
  16. 39. Planetary motion pioneer
  17. 40. Giant planets lack this layer of the atmosphere
  18. 42. Early stage of a star’s life
  19. 44. Nursery cloud for stars
  20. 46. Volcanic moon
  21. 48. Flux and luminosity tell us
  22. 49. Baby planet building block
  23. 50. Moon with underground ocean
  24. 53. Convection cells of liquid core
  25. 55. Energy balance state
  26. 57. Course or trajectory
  27. 58. Moon that herds rings
  28. 59. Oval
  29. 60. Sun’s celestial path
  30. 61. Element needed for life
  31. 62. Planet with disproportionately large core
  32. 65. Earth’s retrograde twin
  33. 67. Moon faces
  34. 70. East-west winds
  35. 71. “Non-differentiated”
  36. 72. Viewing stretched waves
  37. 73. What rocks are made of
  38. 74. Ice forms here
  39. 75. Giant planet on its side
  40. 76. Youngest areas of Moon
  41. 77. Point of orbit closest to Sun
  42. 78. Point of orbit farthest from Sun
Down
  1. 1. Largest planet in our Solar System
  2. 2. Green and blue charged particles
  3. 4. Spins
  4. 6. A spectroscopic binary
  5. 7. Runaway icehouse effect here
  6. 8. Hot rock layer
  7. 9. Equinox opposite
  8. 12. Second largest moon
  9. 14. Focus point of orbit
  10. 15. Mass x speed
  11. 17. Colloquially brightness
  12. 18. Sky’s imaginary sphere around Earth
  13. 19. Foreign planets
  14. 21. Twisting force
  15. 22. Light shining out
  16. 26. Longitudinal waves
  17. 27. Oldest surface of Moon
  18. 29. Process created a layered Earth
  19. 30. Frozen space traveler
  20. 31. Light swallowed up
  21. 33. Instrument to zoom
  22. 34. Color shift from movement
  23. 38. Where convection occurs
  24. 41. Mass x speed x radius
  25. 43. Oceans rise and fall
  26. 45. “Differentiated”
  27. 47. Stabilizing climate feedback
  28. 51. Weakest fundamental force
  29. 52. First spacecraft Mercury
  30. 54. Viewing compressed waves
  31. 56. Rocky space traveler
  32. 61. Sky region
  33. 63. Meteor’s mark
  34. 64. Creates colors from white
  35. 66. Movement of Earth’s crust
  36. 68. Most abundant giant planet element
  37. 69. Crater that killed the dinos
  38. 79. Tiny light particle