Ready to put your knowledge of the universe to the test? This collection of 100 astronomy quiz questions will take you from basic facts to the strange and surprising corners of outer space.
We’ve structured the quiz in 10 rounds of 10, covering everything from planets and stars to space missions, black holes, and cosmic oddities. Whether you’re revising for a science challenge or just enjoy answering space quiz questions for fun, this is the ultimate trivia set for curious minds.
Round 1: Astronomy Basics
1. What is the closest planet to the Sun?
2. Which planet is known for its rings?
3. What is the name of our galaxy?
4. Which planet is often called the Red Planet?
5. What is the hottest planet in the solar system?
6. Which planet has the most moons?
7. What type of celestial object is the Sun?
8. What’s the only planet that supports life (as we know it)?
9. Which planet rotates on its side, with a tilted axis of ~98 degrees?
10. What is the largest planet in our solar system?
Round 2: Solar System
11. How many planets are in the solar system?
12. What is the smallest planet in our solar system?
13. Which planet has the shortest day?
14. What is the name of Mars’ largest moon?
15. Which planet has a storm called the Great Red Spot?
16. What gas makes up most of Earth’s atmosphere?
17. What is the fifth planet from the Sun?
18. Which planet is known for its extreme winds and dark blue color?
19. What is the coldest planet in the solar system?
20. Which planet has the nickname “Morning Star”?
Round 3: The Moon & Earth’s Relationship
21. What is the name of Earth’s only natural satellite?
22. How long does it take the Moon to orbit Earth?
23. What do we call the phenomenon when the Moon blocks the Sun?
24. What causes the ocean tides on Earth?
25. What phase is the Moon in when it appears completely dark?
26. What is it called when the Moon appears fully lit?
27. What is the term for the Moon gradually becoming more visible?
28. What is the term for the Moon gradually becoming less visible?
29. What’s the name of the first spacecraft to land humans on the Moon?
30. Who was the first person to walk on the Moon?
Round 4: Stars & Galaxies
31. What is the closest star to Earth?
32. What is the second closest star system to Earth?
33. What color are the hottest stars?
34. What do we call a star that suddenly increases in brightness?
35. What is a massive star’s final stage called after a supernova?
36. What is the name of the galaxy closest to the Milky Way?
37. What are stars primarily made of?
38. What type of star is our Sun classified as?
39. What do we call a group of stars forming a pattern in the sky?
40. What is the brightest star in the night sky?
Round 5: Space Exploration
41. What year did humans first land on the Moon?
42. What was the name of the first artificial satellite launched into space?
43. Which country launched Sputnik 1?
44. Who was the first human in space?
45. Which NASA mission successfully landed the first humans on the Moon?
46. What is the name of the space telescope launched in 1990 that orbits Earth?
47. What is the name of the first reusable space shuttle?
48. What space agency is responsible for Mars rovers like Curiosity and Perseverance?
49. Which billionaire founded SpaceX?
50. What is the name of the international space station orbiting Earth?
Round 6: Space Phenomena
51. What is a sudden burst of energy from the sun called?
52. What is the name for a small rocky body that enters Earth’s atmosphere and burns up?
53. What do we call it when a meteor survives the atmosphere and hits Earth?
54. What is the glowing tail behind a comet made of?
55. What causes an aurora (like the Northern Lights)?
56. What is a supernova?
57. What is the name for a region of space where gravity is so strong not even light can escape?
58. What is the boundary around a black hole called?
59. What do we call a frozen ball of ice and dust that orbits the Sun?
60. What is a galaxy?
Round 7: Space Missions & Probes
61. What was the name of the first successful Mars rover?
62. What twin spacecraft launched in 1977 are now in interstellar space?
63. What probe famously took a photo called “The Pale Blue Dot”?
64. What was the name of the mission that landed the Perseverance rover on Mars?
65. What spacecraft studied Saturn and its moons for over a decade?
66. What NASA mission brought back samples from an asteroid in 2023?
67. What mission landed on the surface of a comet for the first time?
68. What country launched the Chang’e missions to the Moon?
69. What telescope replaced Hubble as NASA’s flagship space observatory?
70. What company launched the first private spacecraft to dock with the ISS?
Round 8: Space Measurements & Units
71. What unit is commonly used to measure distances between stars?
72. How fast does light travel in a vacuum (in km/s)?
73. How long does it take light from the Sun to reach Earth?
74. What is the average distance from Earth to the Sun?
75. What is the term for the apparent shift in a star’s position due to Earth’s movement?
76. What is the unit AU short for?
77. How many Earth days does it take the Moon to orbit Earth?
78. What is a parsec roughly equal to in light-years?
79. What scale is used to classify the brightness of stars?
80. What does redshift in a star’s light indicate?
Round 9: Astronomy in Culture & History
81. Who proposed the heliocentric model of the solar system?
82. Which ancient civilization built Stonehenge to align with astronomical events?
83. Who was the first person to use a telescope to study the stars?
84. Which scientist developed the laws of planetary motion?
85. What did ancient cultures often believe comets were?
86. What star guided the wise men in the biblical Nativity story?
87. What is the name of the Greek god associated with the Sun?
88. What did the Mayans use to predict eclipses and solstices?
89. What famous 17th-century book did Galileo write defending heliocentrism?
90. What ancient tool was used to measure the position of stars before telescopes?
Round 10: Space Oddities & Fun Facts
91. What planet rains diamonds, according to scientists?
92. Which moon in our solar system has active volcanoes?
93. What planet has a day longer than its year?
94. What’s the largest volcano in the solar system?
95. What is the coldest known place in the universe?
96. What happens to metal in space when two pieces touch?
97. Can sound travel in space?
98. Which planet has the highest mountain in the solar system?
99. How long is one day on Jupiter?
100. What’s the only human-made object in interstellar space?
The end
Finished all 100 space quiz questions? Well done — this was more than just a quick round of trivia.
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The universe is full of questions — we’ve just scratched the surface.
Proxima Centauri is the closest star to earth (other than the sun) and not Alpha Centauri. Alpha Centauri is a 3 star system of which Proxima Centauri is a component.