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30 Challenging Space Trivia Questions and Answers

By Kenton·Updated Aug 2025·4 min read

Blast off into a universe of knowledge with this stellar collection of space trivia. From planets and galaxies to astronauts and groundbreaking missions, these questions are perfect for anyone fascinated by the cosmos. Whether you're a stargazer or a science buff, get ready to explore the final frontier one fact at a time.

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  1. 1What is the largest planet in our solar system?

  2. 2Which planet is known as the ‘Red Planet’?

  3. 3How long does it take for the light from the Sun to reach the Earth?

  4. 4Which planet has the most moons?

  5. 5What is the largest moon in the Solar System?

  6. 6What was the first animal to orbit Earth?

  7. 7What is the speed of light?

  8. 8What are comets made of?

  9. 9What is a supernova?

  10. 10What is the hottest planet in our solar system?

  11. 11What is the name of the largest volcano in the solar system?

  12. 12What is the name of the first man-made object to leave the solar system?

  13. 13What is the name of the most prominent ring of Saturn?

  14. 14What is the primary component of the Sun?

  15. 15What type of galaxy is the Milky Way?

  16. 16What is the name of the nearest major galaxy to the Milky Way?

  17. 17What is the distance between the Earth and the Moon?

  18. 18What is the age of the universe?

  19. 19What type of planet is Neptune?

  20. 20What is the largest dwarf planet in our solar system?

  21. 21What is a pulsar?

  22. 22What causes a solar eclipse?

  23. 23What was the name of the first human to walk on the moon?

  24. 24What is the name of the galaxy that is on a collision course with the Milky Way?

  25. 25Which planet has the shortest day of all the planets?

  26. 26How many stars does the Milky Way contain?

  27. 27What is the diameter of the Earth?

  28. 28What was the first spacecraft to visit Mars?

  29. 29What is a white dwarf?

  30. 30What is a black hole?

Answer Key

  1. 1. Jupiter
  2. 2. Mars
  3. 3. About 8 minutes and 20 seconds
  4. 4. Jupiter
  5. 5. Ganymede
  6. 6. A dog named Laika
  7. 7. Approximately 299,792 kilometers per second
  8. 8. Ice, dust, and rocky material
  9. 9. A stellar explosion that briefly outshines an entire galaxy
  10. 10. Venus
  11. 11. Olympus Mons on Mars
  12. 12. Voyager 1
  13. 13. The B ring
  14. 14. Hydrogen
  15. 15. Spiral galaxy
  16. 16. Andromeda
  17. 17. 238,855 miles (384,400 km)
  18. 18. Around 13.8 billion years
  19. 19. A gas giant
  20. 20. Pluto
  21. 21. A highly magnetized, rotating neutron star that emits beams of electromagnetic radiation
  22. 22. The Moon passing between the Earth and the Sun
  23. 23. Neil Armstrong
  24. 24. Andromeda Galaxy
  25. 25. Jupiter
  26. 26. Estimated between 100-400 billion stars
  27. 27. Approximately 7,917.5 miles (12,742 km)
  28. 28. Mariner 4
  29. 29. A small very dense star that is typically the size of a planet
  30. 30. A region of space having a gravitational field so intense that no matter or radiation can escape

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