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100 Solar System and Space Basics: Planets, Orbits, Moons Practice Questions (2026)

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Full Question List

  1. Question 1

    What is the solar system?

  2. Question 2

    What star is at the center of our solar system?

  3. Question 3

    What is a star?

  4. Question 4

    What is a planet?

  5. Question 5

    What is a dwarf planet?

  6. Question 6

    What is an asteroid?

  7. Question 7

    What is a comet?

  8. Question 8

    What is a meteoroid?

  9. Question 9

    What is a meteor?

  10. Question 10

    What is a meteorite?

  11. Question 11

    What is a galaxy?

  12. Question 12

    What galaxy do we live in?

  13. Question 13

    What is a light year?

  14. Question 14

    What is an astronomical unit (AU)?

  15. Question 15

    What is an orbit?

  16. How many did you know?

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  17. Question 16

    What is rotation?

  18. Question 17

    What is revolution in space terms?

  19. Question 18

    What is an axis?

  20. Question 19

    What is gravity?

  21. Question 20

    Why do planets stay in orbit?

  22. Question 21

    Which planets are the inner planets?

  23. Question 22

    Which planets are the outer planets?

  24. Question 23

    Which planets are terrestrial?

  25. Question 24

    Which planets are gas giants?

  26. Question 25

    Which planets are ice giants?

  27. Question 26

    Which planet is the largest?

  28. Question 27

    Which planet is the smallest?

  29. Question 28

    Which planet is the hottest?

  30. Question 29

    Which planet is known for its rings?

  31. Question 30

    Which planet has the Great Red Spot?

  32. How many did you know?

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  33. Question 31

    Which planet is called the Red Planet?

  34. Question 32

    Which planet has the most prominent rings?

  35. Question 33

    Which planet has an extreme tilt?

  36. Question 34

    Which planet is farthest from the Sun?

  37. Question 35

    Which planet is closest to the Sun?

  38. Question 36

    What is Earths only natural satellite called?

  39. Question 37

    Which planets have no moons?

  40. Question 38

    Which types of planets tend to have many moons?

  41. Question 39

    What is a natural satellite?

  42. Question 40

    What causes the phases of the Moon?

  43. Question 41

    What is a lunar eclipse?

  44. Question 42

    What is a solar eclipse?

  45. Question 43

    Why do we see the same side of the Moon?

  46. Question 44

    What is tidal locking?

  47. Question 45

    What is an orbital period?

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  49. Question 46

    What is a day on Earth?

  50. Question 47

    What is a year on Earth?

  51. Question 48

    What causes seasons on Earth?

  52. Question 49

    What is axial tilt?

  53. Question 50

    What is an atmosphere?

  54. Question 51

    What is a vacuum in space?

  55. Question 52

    What is escape velocity?

  56. Question 53

    What causes a comet tail?

  57. Question 54

    Where is the asteroid belt?

  58. Question 55

    What is the Kuiper Belt?

  59. Question 56

    What is the Oort Cloud?

  60. Question 57

    Name one dwarf planet.

  61. Question 58

    Why is Pluto a dwarf planet?

  62. Question 59

    What is an artificial satellite?

  63. Question 60

    What is a space probe?

  64. How many did you know?

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  65. Question 61

    What is a telescope?

  66. Question 62

    What is a rocket?

  67. Question 63

    What is thrust?

  68. Question 64

    What shape are most planetary orbits?

  69. Question 65

    What is perihelion?

  70. Question 66

    What is aphelion?

  71. Question 67

    What is a crater?

  72. Question 68

    How does gravity affect weight?

  73. Question 69

    Which planet has the strongest gravity?

  74. Question 70

    Which planet has a very thick atmosphere?

  75. Question 71

    Which planet has liquid water on its surface?

  76. Question 72

    What are planetary rings made of?

  77. Question 73

    Which planets have ring systems?

  78. Question 74

    What is the heliocentric model?

  79. Question 75

    Who is known for the heliocentric model?

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  81. Question 76

    What is a constellation?

  82. Question 77

    What is a nebula?

  83. Question 78

    What is a supernova?

  84. Question 79

    What is a black hole?

  85. Question 80

    What is an exoplanet?

  86. Question 81

    What is a spacecraft?

  87. Question 82

    What is a space station?

  88. Question 83

    What is microgravity?

  89. Question 84

    Why do astronauts float in orbit?

  90. Question 85

    What is a launch window?

  91. Question 86

    What is solar wind?

  92. Question 87

    What is a solar flare?

  93. Question 88

    What causes auroras on Earth?

  94. Question 89

    What is a magnetic field?

  95. Question 90

    What is Earths magnetosphere?

  96. How many did you know?

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  97. Question 91

    What are constellations used for?

  98. Question 92

    What is a planetary system?

  99. Question 93

    What is the habitable zone?

  100. Question 94

    What is a rover in space exploration?

  101. Question 95

    What is a lander?

  102. Question 96

    What is a flyby mission?

  103. Question 97

    What is a geostationary orbit?

  104. Question 98

    What is a polar orbit?

  105. Question 99

    What is a satellite used for?

  106. Question 100

    What is the universe?

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