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Solar System Quiz Questions

Solar System Trivia: The eight planets of the Solar System (by decreasing size) are Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars and Mercury.

  1. Name the first man made object to leave the Solar System and cross into interstellar space?
  2. Which planet is sometimes referred to as the Earth’s sister planet due the their similar sizes?
  3. What is the largest moon of Jupiter?
  4. Which planet has two tiny natural satellites named Deimos and Phobos?
  5. How old is The Solar System estimated to be: (a)560 million years, (b)2.6 billion years, or (c) 4.6 billion years?

  6. Name the largest object in the asteroid belt?
  7. As of 2016, how many people have walked on the moon?
  8. The asteroid belt lies between which two planets?
  9. Name the largest dwarf planet - it's also the ninth largest body orbiting the Sun?
  10. The Great Red Spot is a storm on which planet in the Solar System?
  11. Which planet was discovered in 1781 by Sir William Herschel?
  12. What is the hottest planet in the solar system?
  13. What word meaning 'Jupiter like' can be used to describe the four large outer planets?
  14. In which year was Pluto demoted to the newly created category of 'dwarf planet'?
  15. The ring of icy bodies beyond Neptune is known as: (a)the Kelvin Belt, (b) the Kirchkoff Belt, or (c)the Kuiper Belt?


  1. Voyager 1
  2. Venus
  3. Ganymede
  4. Mars
  5. 4.6 billion
  6. Ceres
  7. 12
  8. Mars and Jupiter
  9. Eris
  10. Jupiter
  11. Uranus
  12. Venus (although Mercury is nearest the sun)

  13. Jovian
  14. 2006
  15. The Kuiper Belt